| I'd check the RAM first. Did you add any aftermarket RAM? Also, make sure the RAM chips themselves are properly and firmly seated and locked into the proper positions in the slots -- taking them out and reseating them might help as well.
With each release of OS X, starting with 10.2, the system has gotten pickier and pickier about the quality of the RAM in the machine -- even Apple's own RAM has been known to cause problems in some isolated cases.
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