Macbook Reinstall Os From Usb

When people are planning to sell the old MacBook Pro, or trying to fix issues on a MacBook Pro by doing a clean install of software, they first need to restore the computer to factory settings. It is the best way to wipe a Mac and able to erase all the data and content from a Mac. It is easy said than done. A MacBook Pro usually connects to iCloud, iTunes and other Apple services. To factory reset MacBook Pro, you have to do more than resetting a smartphone. Don't worry! This tutorial enables you to perform an unblemished factory reset MacBook Pro.

1. Macbook Reinstall Os From Usb Flash Drive
2. Reinstall Macos Usb Stick

Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer. Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Pick Reinstall MacOS or Reinstall OS X, you MacBook Pro will start connecting to Apple servers and downloading the Mac OS automatically through Wi-Fi network or Ethernet. The Mac OS version reinstalled depends on the key combination that you used in step 1. After reinstallation is complete, your MacBook Pro will restart. A factory reset's also a necessary process if you're looking to sell your MacBook Air, in order to remove any and all user data left on the computer. MacOS has a built-in recovery disk utility to help you erase and reinstall the operating system, which you can redownload from inside the boot display on your Mac. Turn on the MacBook Pro and immediately hold down the Option key. Select the hard disk, and boot off of it. It'll be a bit slower than it was before because you're using USB instead of SATA, but you can try running Disk Utility from there to see if there's something wrong with the SSD, or if the data transfer didn't complete.

Part 1: What is factory reset a MacBook Pro?

Before you factory reset MacBook Pro, you may be still confused about what is factory reset and why do it. Briefly, factory reset is to erase all personal data and content from a device permanently and return it to factory conditions in the box.

People prefer to store photos, documents, iTunes account and other information on Mac computers. Factory reset is the best way to protect your privacy and information when you want to sell your MacBook Pro or put it to another hand.

On the other hand, factory resetting MacBook Pro is an ultimate solution to resolve various problems. Problems and complaints emerge continuously since MacBook Pro has been launched, such as blue screen, responding incorrectly and more. Factory reset is the latest means to fix a MacBook Pro before giving it up completely.

Part 2: Preparation before factory reset MacBook Pro

As said before, factory reset MacBook Pro is a little complicated than other devices, partly because there are more work about preparation, including backup, sign out iTunes, iCloud and other accounts.

Step 1. Create a backup for your MacBook Pro

To avoid data loss, backup everything on your Mac is necessary before factory resetting MacBook Pro. There are two methods to create a backup for MacBook Pro.

To back up your device, plug a large enough USB flash or external drive, go to System Preferences-> Time Machine, select Backup Disk, then follow the onscreen instructions to format the drive and transfer all files you want to back up.

Another way is to clone entire hard drive. The programs, like Carbon Copy Cloner and SuperDuper, could copy all data and information on your hard drive to an external hard drive.

The difference between backup with Time Machine and cloning is that former supports selectively copying. Cloning a hard drive means copy all information, including errors, malfunctions, configuration issues and even viruses.

Step 2. Sign out all accounts and services on your Mac

This step includes disabling iTunes, iCloud, FileVault and other apps link to your hardware. iTunes supports to set up to five Mac devices with one account. Disabling iCloud could remove some of personal content from Mac. And the FineVault is designed to encrypt your files on hard drive. So it is better to turn off these services before factory reset MacBook Pro.

• 1. De-authorize iTunes. Start iTunes, click Store and then Deauthorize This Computer, input your Apple ID and password and hit De-authorise to confirm it. If you use an old version of iTunes, the Deauthorize This Computer is in Account > Authorisations.
• 2. Turn off iCloud. Open iCloud in System Preferences, click Sign Out Now and then hit Delete from Mac on each popup dialog.
• 3. Sign out FileVault. Go to System Preferences-> Security & Privacy-> FileVault and turn off File Vault. You will be prompted to enter your password to confirm it.

Besides three services above, you may need to sign out other apps, such as Adobe Photoshop, Netflix and more. And if your MacBook Pro has Touch Bar, you also need to remove any Apple Pay card information.

Part 3: Start factory resetting MacBook Pro

After backup and sign out various services, you can feel free to start factory resetting MacBook Pro

Step 1. Boot your MacBook Pro in Recovery Mode

Click the Apple logo at the upper left corner of the screen and select Restart, then press and hold down the Command and R keys until Apple logo appears on the screen.

There are three key combinations of Mac OS Recovery, Command + R, Option + Command + R, and Shift + Option + Command + R. The first will install the latest Mac OS version without upgrading. The second will upgrade to the latest Mac OS. And the latter will install the Mac OS that came with your MacBook Pro.

Step 2. Erase your MacBook Pro's hard drive

When the Recovery Mode Utilities window shows up, pick Disk Utility and click Continue. Select your main hard drive usually called Macintosh HD.

Click the Erase button on top ribbon of Disk Utility to start erasing your hard drive for factory reset MacBook Pro. When it is done, close the application by clicking Disk Utility and then Quit Disk Utility.

When choose hard drive, you should look for the disk name, but not the volume name.

Step 3. Reinstall Mac on your MacBook Pro

Once the Disk Utility is closed, the Mac OS reinstallation window will present. Pick Reinstall MacOS or Reinstall OS X, you MacBook Pro will start connecting to Apple servers and downloading the Mac OS automatically through Wi-Fi network or Ethernet. The Mac OS version reinstalled depends on the key combination that you used in step 1. After reinstallation is complete, your MacBook Pro will restart. If you want to continuously use your computer, log in with your Apple ID and password. Otherwise, hold down Command + Q to skip the setup process.

The guides above are universal process of factory reset MacBook Pro. The detail menus may differ slightly depending on the version of iTunes, Mac OS and MacBook Pro you are using. Even though it may not match exactly, that's OK since the meaning is the same.

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Conclusion

In this tutorial, we have told you how to factory reset MacBook Pro. There are a number of reasons that you need to reset your MacBook Pro to its factory settings. Perhaps, you will sell it and wipe your data off of it. Maybe it is not working properly or infected with virus. Anyway, you will find that factory reset MacBook Pro is not as difficult as you thought if you follow our guides above. To return your MacBook Pro to factory status, you'd better back it up first. And the final step, re-install the Mac OS, needs the internet connection. If you have any questions about factory reset your MacBook Pro, please leave a message below this post.

To identify your MacBook Pro model, use the information in How to identify MacBook Pro models.

Once you're sure which model you have, find it in the list below to go to the instructions for that model. Note: Apple notebooks not listed in this table have non-removable memory.

Applicable Models

The instructions provided below are for the following MacBook Pro (13-inch) models:

• MacBook Pro (13-inch, Mid 2012)
• MacBook Pro (13-inch, Late 2011)
• MacBook Pro (13-inch, Early 2011)
• MacBook Pro (13-inch, Mid 2010)
• MacBook Pro (13-inch, Mid 2009)

Memory specifications

Use the tables below to confirm the memory you're installing is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the bottom case

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
   
3. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 2: Remove existing memory (if present)

1. Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don't, try pressing the levers outward again.
2. Hold the memory module by its notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges, and do not touch the gold connectors.
   

Step 3: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.
   Note: Make sure you install the memory according to this illustration, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace the bottom case. Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable Models

The instructions provided below are for the following MacBook Pro 15-inch models:

• MacBook Pro (15-inch, Mid 2012)
• MacBook Pro (15-inch, Late 2011)
• MacBook Pro (15-inch, Early 2011)
• MacBook Pro (15-inch, Mid 2010)
• MacBook Pro (15-inch, 2.53GHz Mid 2009)
• MacBook Pro (15-inch, Mid 2009)

Memory specifications

Please use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the bottom case

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
   
3. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 2: Remove existing memory (if present)

1. Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don't, try pressing the levers outward again.
2. Hold the memory module by its notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges, and do not touch the gold connectors.

Step 3: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.Note: Make sure you install the memory according to this illustration, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable model

The instructions provided below are for the following MacBook Pro 15-inch models:

• MacBook Pro (15-inch, Late 2008)

Memory specifications

Please use the table below to confirm the memory being installed is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the access door

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, security lock, and any other cords connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and locate the latch. Push down to release the latch and remove the access door that covers the battery and hard drive.
3. The latch must be in its released, open position to remove the access door.

Step 2: Remove the battery

With the latch still in its open position, gently pull up on the tab to remove the battery.

Step 3: Remove the bottom case

1. Remove the eight screws that secure the bottom case of your MacBook Pro, and then remove the bottom case.
   Important: Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place.
   
2. Touch a metal surface inside the computer to discharge any static electricity from your body.

Step 4: Remove existing memory (if present)

1. Push out the ejection levers on the sides of the memory module to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don't, try pressing the ejection levers again.
2. Hold the memory module by the notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges; do not touch the gold connectors.
   

Step 5: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat, if necessary, to install an additional memory module in the top slot. Press down on the module to make sure it is level.
   Note: Make sure you install the memory according to the illustration below, with the gold contacts inserted almost completely into the connector.
   

Step 6: Replace the bottom case

Macbook Reinstall Os From Usb Flash Drive

Replace the bottom case. Replace and tighten the eight screws.

Step 7: Replace the battery

To replace the battery, make sure the latch is in its open position. Hold the battery at an angle and slide the lipped edge of the battery below the brackets on the outside edge of the battery bay. Gently press the battery down.

Step 8: Replace the access door

With the latch in the open position replace the access door, making sure it is level with the bottom case of your MacBook Pro, and press the latch into the closed position.

Applicable models

The instructions provided below are for the following MacBook Pro 17-inch models:

• MacBook Pro (17-inch, Late 2011)
• MacBook Pro (17-inch, Early 2011)
• MacBook Pro (17-inch, Mid 2010)
• MacBook Pro (17-inch, Mid 2009)
• MacBook Pro (17-inch, Early 2009)

Memory specifications

Use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the bottom case

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
   
3. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 2: Remove existing memory (if present)

1. Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you can't find the notches, try pressing the levers outward again.
2. Hold the memory module by its notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges; do not touch the gold connectors.
   

Step 3: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.
   Note: Make sure your memory is installed according to the illustration below, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace the bottom case. Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable models

The instructions provided below are for the following MacBook Pro 15-inch and 17-inch models:

• MacBook Pro (17-inch, Late 2008) and earlier
• MacBook Pro (15-inch, Early 2008) and earlier

Memory specifications

Please use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the bottom case

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
   
3. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 2: Remove existing memory (if present)

1. Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don't, try pressing the levers outward again.
2. Hold the memory module by its notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges, and do not touch the gold connectors.
   

Step 3: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.
   Note: Make sure you install the memory according to this illustration, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace the bottom case. Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable Models

The instructions provided below are for the following MacBook Pro 15-inch models:

• MacBook Pro (15-inch, Mid 2012)
• MacBook Pro (15-inch, Late 2011)
• MacBook Pro (15-inch, Early 2011)
• MacBook Pro (15-inch, Mid 2010)
• MacBook Pro (15-inch, 2.53GHz Mid 2009)
• MacBook Pro (15-inch, Mid 2009)

Memory specifications

Please use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the bottom case

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
   
3. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 2: Remove existing memory (if present)

1. Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don't, try pressing the levers outward again.
2. Hold the memory module by its notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges, and do not touch the gold connectors.

Step 3: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.Note: Make sure you install the memory according to this illustration, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable model

The instructions provided below are for the following MacBook Pro 15-inch models:

• MacBook Pro (15-inch, Late 2008)

Memory specifications

Please use the table below to confirm the memory being installed is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the access door

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, security lock, and any other cords connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and locate the latch. Push down to release the latch and remove the access door that covers the battery and hard drive.
3. The latch must be in its released, open position to remove the access door.

Step 2: Remove the battery

With the latch still in its open position, gently pull up on the tab to remove the battery.

Step 3: Remove the bottom case

1. Remove the eight screws that secure the bottom case of your MacBook Pro, and then remove the bottom case.
   Important: Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place.
   
2. Touch a metal surface inside the computer to discharge any static electricity from your body.

Step 4: Remove existing memory (if present)

1. Push out the ejection levers on the sides of the memory module to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you don't, try pressing the ejection levers again.
2. Hold the memory module by the notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges; do not touch the gold connectors.
   

Step 5: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat, if necessary, to install an additional memory module in the top slot. Press down on the module to make sure it is level.
   Note: Make sure you install the memory according to the illustration below, with the gold contacts inserted almost completely into the connector.
   

Step 6: Replace the bottom case

Macbook Reinstall Os From Usb Flash Drive

Replace the bottom case. Replace and tighten the eight screws.

Step 7: Replace the battery

To replace the battery, make sure the latch is in its open position. Hold the battery at an angle and slide the lipped edge of the battery below the brackets on the outside edge of the battery bay. Gently press the battery down.

Step 8: Replace the access door

With the latch in the open position replace the access door, making sure it is level with the bottom case of your MacBook Pro, and press the latch into the closed position.

Applicable models

The instructions provided below are for the following MacBook Pro 17-inch models:

• MacBook Pro (17-inch, Late 2011)
• MacBook Pro (17-inch, Early 2011)
• MacBook Pro (17-inch, Mid 2010)
• MacBook Pro (17-inch, Mid 2009)
• MacBook Pro (17-inch, Early 2009)

Memory specifications

Use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

Removing or installing memory

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the bottom case

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, USB cables, security lock, and any other cables connected to the MacBook Pro to prevent damaging the computer.
2. Turn over your MacBook Pro and remove the ten (10) screws that secure the bottom case. Because the screws are different lengths, note the screw lengths and locations so you can replace the screws correctly. Put them aside in a safe place. Lift off the case and place it to the side.
   
3. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 2: Remove existing memory (if present)

1. Push the levers on the sides of the memory module in an outward direction to release the module from the memory card slot. The memory pops up at an angle. Before removing it, make sure you find the half-circle notches. If you can't find the notches, try pressing the levers outward again.
2. Hold the memory module by its notches and remove it from the slot.
3. Remove the other memory module.
   Important: Hold the memory modules by their edges; do not touch the gold connectors.
   

Step 3: Install memory

1. Align the notch on the gold edge of the module with the notch in the lower memory slot.
2. Tilt the card and push the memory into the slot.
3. Use two fingers with firm, even pressure to push down on the memory module. There should be a click when you insert the memory correctly.
4. Repeat this procedure to install an additional memory module in the top slot. Press down on the module to make sure it is level.
   Note: Make sure your memory is installed according to the illustration below, with the gold contacts inserted almost completely into the connector.

Step 4: Replace the bottom case

Replace the bottom case. Replace and tighten the ten screws you removed earlier, making sure to put the different length screws in their proper locations.

Applicable models

The instructions provided below are for the following MacBook Pro 15-inch and 17-inch models:

• MacBook Pro (17-inch, Late 2008) and earlier
• MacBook Pro (15-inch, Early 2008) and earlier

Memory specifications

Please use the tables below to confirm the memory being installed is compatible with your MacBook Pro.

Refer to this table for the maximum amount of memory that can be recognized by these notebook computers:

Removing or installing memory

You will need to remove the battery before installing additional memory and reinstall the battery after installing the memory. The following procedure includes all the necessary instructions for both parts of the process.

Warning: The internal components of your MacBook Pro can be warm. If you have been using your MacBook Pro, wait ten minutes after shutting down the computer to let the internal components cool before continuing.

Step 1: Remove the battery

1. Shut down your MacBook Pro. Disconnect the power adapter, Ethernet cable, and any other cords connected to the MacBook Pro to prevent damaging the computer.
2. Turn the computer over.
3. Locate the battery release latches on each side of the battery.
4. Slide both latches up. The battery should pop up slightly.
5. Lift the battery out.
   

Step 2: Remove the memory door

1. Using a Phillips size 00 screwdriver, unscrew the memory door and remove it from the battery bay of your computer. Depending on the model of your MacBook Pro, you may have three or four screws.
   
2. Touch a metal surface inside the computer to discharge any static electricity from your body.
   

Step 3: Remove existing memory (if present)

Reinstall Macos Usb Stick

If you need to remove a memory card—for example if you are replacing it or if you need to get past the memory in the top slot to access the bottom slot—you can remove the card by spreading the tabs on each side of the card away from the notches in the memory card. The card should pop up slightly. Lift the memory card to about a 25-degree angle and then gently slide the card out of the memory slot.
Important: Hold the memory modules by their edges; do not touch the gold connectors.

Step 4: Install memory

1. Insert the new memory card at a 25-degree angle. Line up the notch in the card with the small tab in the memory slot and slide the card into the slot until the gold edge is almost invisible. Firmly press the memory card into the memory slot. You might feel some resistance.
2. Gently spread the small tabs in the memory slot away from the notches and push the memory card down until the two tabs on either side of the card lock into place.
3. Insert any additional memory into the second slot.
   Note: Make sure you install the memory according to the illustration below, with the gold contacts inserted almost completely into the connector.
   

Step 5: Replace the memory door

Replace the memory door, and make sure the door is lying flat before you screw it back into place.

Step 6: To insert the battery

1. Place the bottom edge of the battery into the battery compartment at an angle, as shown below.
2. Gently press the top edge of the battery down until the battery latch locks into place.
   

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Checking that your computer recognizes the new memory

After installing additional memory, you should confirm that the computer recognizes the new memory. To check the computer's memory:

1. Start up your computer.
2. When you see the Mac OS X desktop, choose the Apple () menu from the upper-left menu bar, then choose About This Mac.

The total memory includes the amount of memory that originally came with the computer plus the new memory you added, or if all the memory has been replaced, the new total for that memory. For detailed information about the amount of memory installed in your computer, open System Profiler by choosing Apple () and then About This Mac. Then, click More Info and then Memory from the Hardware section that appears in System Profiler.

If your computer doesn't recognize the memory or doesn't start up correctly, confirm that the memory you installed is compatible with your MacBook Pro and that it is installed correctly by reseating the memory.