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Helpful answers
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Oct 28, 2014 11:36 AM in response to ggassby K Shaffer,You may be able to locate identifying information including a serial number on
the computer without starting it; but sometimes not. See this Support article:
•How to identify MacBook Pro models
Have you tried alternative methods via keyboard shortcuts, to access the Mac?
You should be able to start the Mac into Recovery via these instructions:
From there, you could see about investigating the issue; perhaps attempt to
re-install the OS X, or see if OS X Utilities could check the hard drive or test
for other causes of the problem. Much of the issue you seem to face could be
related to lack of proper implementation of upgrade preparation. A healthy OS
can be upgraded more easily & work correctly; old issues mess with upgrades.
You may also see if the computer could be started up in Safe Boot, where
you'd hold the Shift key on startup, and keep holding it until there is evidence
of some OS X or desktop activity, this could take many minutes. Maybe 5+.
•OS X: What is Safe Boot, Safe Mode?
There may be other things you could try & do to access the system; at some
point, if you can boot up in Safe mode, then see About this Mac in the Apple
Finder menu. That should be able to show the system info, and serial number.
If you do not hold down the Shift key long enough, the computer will not start
up, or enter SafeBoot mode. The Recovery sequence may allow other access.
And if available, an Apple Store with Genius bar may be able to help resolve
some kinds of issues; you may have to contact them for an appointment. Or
see an Authorized Apple Service Provider, to have them help make it work.
Good luck & happy computing!