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Tons of possible causes.
What did you check for viruses with? If it's AVG/Norton/McAffee, they fucking blow. Boot in Safe Mode w/ Networking and do the online scanner at bitdefender.com (IE only).
Something could have worked it's way loose. Reseat CPU heatsink, RAM, expansion cards, cables.
Is SMART enabled in your BIOS for your harddrive(s)? If not, enable it and check for warnings when it's booting.
Maybe it's a bad DVD drive? They can make your machine act funny sometimes.
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