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Aporte original por: fairleymac ,


First, I would try booting from your OS CD.  If booting from the CD is intermittent, or doesn't work, you know you still have a HW issue.  If the CD works without issue, simply reinstall OS X.  You have a F***ED hard drive.

Also, have you tried (or did the technician) a different set of RAM in the machine?  Although it does sound a lot like a logic board issue, bad RAM might display the kinds of issues you're describing.