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Helpful answers
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Sep 8, 2016 8:22 PM in response to mcdonaldfrommiamiby BDAqua,Can't be the year 1970!?
Corrupted or failing Hard Drive, does it boot holding CMD+r keys?
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Sep 8, 2016 10:37 PM in response to mcdonaldfrommiamiby K Shaffer,If the computer shipped with an OS X on install-restore DVD media
or if you have an interim Snow Leopard 10.6. retail DVD, that may
be used to attempt to troubleshoot the computer. The original kit
included an Apple diagnostic or hardware test on a DVD; it may be
of some help, even though those are not conclusive.
https://www.google.com/#q=mac+os+x+question+mark+on+startup
You would need the install restore disc to reformat a replacement HDD.
Helps if you can identify the computer. That can be done in several ways
to include a 'serial number lookup' such as powerbookmedic site offers.
•Mac Serial Number Info - Lookup your Apple serial number:
https://www.powerbookmedic.com/identify-mac-serial.php
• How to identify Mac mini models - Apple Support
https://support.apple.com/en-us/HT201894
Mar 16, 2016 - Use the information below to help determine which Mac mini model you have.
Model, Marketing Number, Specifications (Processor/RAM/hard drive/optical .... See all quest-
ions on this article See all questions ...
Technical specifications for the Apple Mac mini series. Dates sold, processor type,memory info, hard drive details, estimated retail prices, and more.• Try safe mode if your Mac doesn't finish starting up - Apple Support
https://support.apple.com/en-us/HT201262
Mar 21, 2016 - Verifies your startup disk, and attempts to repair directory issues ifneeded ... If your Mac automatically restarts in safe mode, OS X might have ...• How to fix a Mac that won't start up - Macworld UK
http://www.macworld.co.uk/how-to/mac/10-steps-take-when-your-mac-wont-start-up-o r-turn-on-3423817/Jul 26, 2016 - On a Mac running OS X 10.8 Mountain Lion or later, you can run Disk Utility
by booting into OS X Recovery Mode. Make sure the Mac is off. (If it's not responsive be-
cause it's stuck on a grey, blue or white screen, just hold down the Mac's power button
for several seconds until it gives up and shuts off.)
How to reset a Mac: restore ... · How do I restore my Mac with ...
Once you identify the model build year, the correct following methods of restoring a system
to include replacement (reformat, install) a failed hard drive can be initiated and concluded.
Additional helpful ideas - if you have a backup on Time Machine, etc.
• Apple OS X and Time Machine Tips:
http://www.pondini.org/OSX/Home.html
In any event...
Good luck & happy computing!