How do I restore my Macbook Pro to Mountain Lion?
Reinstalling Mountain Lion
- Restart your computer, and immediately hold down command-r until the gray Apple logo appears.
- If prompted, select your main language and then click the arrow.
- Click Reinstall OS X, and then Continue.
How do I run a hard drive diagnostics on a Mac?
Checking Hard Drive Health on Mac
- Launch Disk Utility, found within the /Applications/Utilities folder.
- Select the Mac hard drive from the left side menu and click on the “First Aid” tab.
- Click on “Verify Disk” in the lower right corner and let it run.
How do I run diagnostics on my MacBook Pro 2011?
Press the “Power” to turn on your MacBook Pro and then press and hold the “D” key before the gray startup screen appears. The Apple Hardware Test screen is displayed. If the screen does not appear, make sure your computer is connected to the Internet and then restart it.
How do I run a diagnostic on my MacBook Pro 2013?
General Apple Diagnostics. This is available for any Mac from June 2013 and newer. To launch Apple Diagnostics, begin with your Mac turned off, and simply start up your Mac and hold down the D key right after pressing the power button. Keep holding the key until you get the option to select a language.
How do you reset a Mac lion?
Restart the computer and after the chime press and hold down the COMMAND and R keys until the menu screen appears. Alternatively, restart the computer and after the chime press and hold down the OPTION key until the boot manager screen appears. Select the Recovery HD and click on the downward pointing arrow button.
What kind of diagnostics can you do on a MacBook Pro?
If your MacBook Pro is from before 2013, you can use Apple Hardware Test instead of Apple Diagnostics. Apple Hardware Test was introduced with OS X Mountain Lion. Apple Hardware Test is essentially an older version of Apple Diagnostics; it checks each internal component on your MacBook Pro looking for any issues.
What does the progress bar on Apple diagnostics mean?
Apple Diagnostics shows a progress bar while it’s checking your Mac: When testing is complete, Apple Diagnostics shows the results, including one or more reference codes. Learn about Apple Diagnostics reference codes.
How long does it take to run Apple diagnostics?
Checking your Mac takes 2 or 3 minutes. If any issues are found, Apple Diagnostics suggests solutions and provides reference codes. Note the reference codes before continuing. Choose from these options: To repeat the test, click ”Run the test again” or press Command (⌘)-R. For more information,…
Is there way to turn off Apple diagnostics?
If holding down the D key at startup doesn’t start Apple Diagnostics: If you’re using a firmware password, turn it off. You can turn it on again after using Apple Diagnostics. Hold down Option-D at startup to attempt to start Apple Diagnostics over the Internet.