Maybe the slocker adapter was goofing off and causing the problem
I have the Asus p3v4x with the Asus 370dl slocket and my system runs fine, I love Asus boards since they have a nice bios to work with
I was thinking of power supply while reading your post but you seem to have resolved the problem, could have been a bad processor as well

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Format c reboot,reboot,reboor,reboot )