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You might be able to call Apple and order a set of the original gray system discs. Last time I did this they were $16 each and I believe there are two of them. The retail disc is an earlier version of Snow Leopard (10.6.0) than was shipped with your Mac (10.6.3 or 10.6.4). The retail disc won't work because your Mac won't run an earlier version of the OS than it originally shipped with. So the problem is not with your computer but with the disc you are trying to use. In all likelihood the computer itself is fine.
If you follow these steps EXACTLY, a bad file named 'mbrcache' will be rebuilt and your Mac will reboot successfully (slowly the first time as the rebuild happens, then normal speed after that). This solution worked on my 2011-vintage 21-inch iMac (iMac 12,1) with Mac OS High Sierra. Blankos Block Party is a new multiplayer universe owned and built by you. Open Beta is out now!
Shut down your Mac. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. Turn on your Mac. Press and hold the Command-Option-P-R keys immediately after you hear the startup sound. Hold these keys until the computer restarts and you hear the. Last time I did this they were $16 each and I believe there are two of them. The retail disc is an earlier version of Snow Leopard (10.6.0) than was shipped with your Mac (10.6.3 or 10.6.4). The retail disc won't work because your Mac won't run an earlier version of the OS than it originally shipped with.
Alternatively, you might be able to visit an Apple Store and see if they could install Sierra for you since your Mac will run it.
Good luck!
Jan 10, 2017 12:32 AM
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Try to start up from macOS Recovery
If your Mac seems to be turned on but nothing is appearing on your display, determine whether you're using a Mac with Apple Silicon, then follow the appropriate steps:
Apple Silicon
- Press and hold the power button for about 10 seconds.
- You should see the startup options window, which includes a gear icon labelled Options. Select Options, then click Continue.
- If the startup options window doesn't appear, release the power button, then press and hold it again for another 10 seconds. If the issue persists, please contact Apple Support.
Intel processor
- Press and hold the power button for about 10 seconds.
- Press and release the power button, then immediately press and hold Command (⌘)-R until you see an Apple logo or other image.
- If you still see a blank screen after about 20 seconds, contact Apple Support.
Use Disk Utility to repair your startup disk
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If your Mac started up successfully from macOS Recovery, you should see a utilities window that includes Disk Utility. Use Disk Utility to repair your startup disk.
If Disk Utility found no errors, reinstall macOS.
If Disk Utility found errors and repaired them, restart your Mac. If the issue returns after you've restarted your Mac, reinstall macOS.
If you still need help, please contact Apple Support.