Upgraded to mavericks, computer now has gray screen with whirly sign and does not load

Upgraded to mavericks last night and computer is dead, gray screen only, tried turning off and on, makes endemic start up noise and then gray screen with whirly circle

Hi cladewig,
Thanks for visiting Apple Support Communities.
If your computer is only starting up to a gray screen and spinning gear, the steps in this article can help:
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/TS2570
Best Regards,
Jeremy

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Carolyn Samit wrote:
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I linked up an external hard drive and installed OSX on it and booted from it. I was able to recover some files, but most I couldn't. I'm currently giving it a one pass erase in the hope (long shot) that a complete pass through the hard drive will show up any faults. Has anyone had this problem and been able to continue using the same hard drive? I really don't relish the thought of having to send it off to be replaced :-/
Assuming that the erase goes well I plan to put OSX back onto it and then run disk utility from directly on the drive and see if any faults show up. I'm kicking myself for not taking advantage of TimeMachine, but we live and learn.

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As a suggestion, you might go to an Apple store (genius bar appointment) for help. As far as I know, there should be no charge.
Barry

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http://support.apple.com/kb/HT4928
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Upgraded to mavericks, computer now has gray screen with whirly sign and does not load

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