If you don't get a startup chime then you may have a worse problem. Just be prepared.
Jun 04, 2017 If the drive is 'Verified' then select your OS X volume from the list on the left (sub-entry below the drive entry,) click on the First Aid tab, then click on the Repair Disk button. If DU reports any errors that have been fixed, then re-run Repair Disk until no errors are reported. May 03, 2018 If you are using a Mac operating system of macOS 10.10.5 or below, you may run into an issue with the permissions of your hard drive. Fix Permissions repairs incorrect file and folder ownership and permissions on startup drives according to Apple specifications. Pick the drive you wish to use to start up the Mac. For more advice about installing macOS or Mac OS X read How to update the Mac operating system and How to install old versions of OS X on a Mac.
Jun 12, 2020 Part 1. How to Recover Data from External Hard Drive on Mac OS X. To recover data from external hard drive on Mac OS X, you can take Recoverit Data Recovery for Mac as a try. This fascinating Mac external hard drive recovery software supports almost all brands of external hard drives, including Seagate, LaCie, Western Digital, Maxtor, Samsung, etc. Mac version Lion (10.7) or newer than this will be able to use the Boot manager to startup from the Recovery partition. Booting from an External Device with Boot Manager. This can be done to select any bootable drive connected to the Mac: Connect the respective external drive to the Mac.
What year is your MBP? From 2011 onward you would use Internet Recovery. Earlier you would need to install the original software that came with the computer on software restore DVDs.
Mac software manage. MacOS makes use of the BSD codebase and the XNU kernel, and its core set of components is based upon Apple's open source Darwin operating system. MacOS is the basis for some of Apple's other operating systems, including iPhone OS / iOS, iPadOS, watchOS, and tvOS.
Internet Recovery
Install Mavericks, Lion/Mountain Lion Using Internet Recovery
Be sure you backup your files to an external drive or second internal drive because the following procedure will remove everything from the hard drive.
Boot to the Internet Recovery HD:
Restart the computer and after the chime press and hold down the COMMAND-OPTION- R keys until a globe appears on the screen. Wait patiently - 15-20 minutes - until the Recovery main menu appears.
Partition and Format the hard drive:
1. Select Disk Utility from the main menu and click on the Continue button.
2. After DU loads select your newly installed hard drive (this is the entry with the mfgr.'s ID and size) from the left side list. Click on the Partition tab in the DU main window.
3. Under the Volume Scheme heading set the number of partitions from the drop down menu to one. Click on the Options button, set the partition scheme to GUID then click on the OK button. Set the format type to Mac OS Extended (Journaled.) Click on the Partition button and wait until the process has completed. Quit DU and return to the main menu.
Reinstall Lion/Mountain Lion. Mavericks: Select Reinstall Lion/Mountain Lion, Mavericks and click on the Install button. Be sure to select the correct drive to use if you have more than one.
Note: You will need an active Internet connection. I suggest using Ethernet
if possiblebecause it is three times faster than wireless.
This should restore the version of OS X originally pre-installed on the computer.
DVD Installation:
Clean Install of Snow Leopard
Be sure to make a backup first because the following procedure will erase
the drive and everything on it.
1. Boot the computer using the Snow Leopard Installer Disc or the Disc 1 that came
with your computer. Insert the disc into the optical drive and restart the computer.
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After the chime press and hold down the 'C' key. Release the key when you see
a small spinning gear appear below the dark gray Apple logo.
2. After the installer loads select your language and click on the Continue
button. When the menu bar appears select Disk Utility from the Utilities menu.
After DU loads select the hard drive entry from the left side list (mfgr.'s ID and drive
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size.) Click on the Partition tab in the DU main window. Set the number of
partitions to one (1) from the Partitions drop down menu, click on Options button
and select GUID, click on OK, then set the format type to MacOS Extended
(Journaled, if supported), then click on the Apply button.
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3. When the formatting has completed quit DU and return to the installer. Proceed
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with the OS X installation and follow the directions included with the installer.
4. When the installation has completed your computer will Restart into the Setup
Assistant. Be sure you configure your initial admin account with the exact same
username and password that you used on your old drive. After you finish Setup
Assistant will complete the installation after which you will be running a fresh
install of OS X. You can now begin the update process by opening Software
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Update and installing all recommended updates to bring your installation current.
Mac Os Hard Drive Space
Download and install Mac OS X 10.6.8 Update Combo v1.1.