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Have MacPro (MacPro1,1) experiencing spontaneous reboots

380 Views 10 Replies Latest reply: Dec 7, 2012 5:49 PM by Grant Bennet-Alder RSS
JimTaylor61 Calculating status...
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Oct 13, 2012 7:38 PM

Have MacPro (MacPro1,1) running Lion 10.7.5 which experiences spontaneous reboots, usually followed by Problem Report being sent to Apple.  When go to computer, usually have gray screen and no further action.  Sometimes have gray screen, but with Spinning Beachball of Death which never stops.  Then I force reboot with power switch.

 

I've reloaded OS several times and Disk Utility fails to identify problems each time I get desktop returning. 

 

Any thoughts on what the problem is?

MacBook Air, OS X Mountain Lion (10.8.2)

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