I had a similar problem, random reboots, no heat problems, strange behavior etc. I replaced all hardware except memory. I found that the problem was that in BIOS if you set the memory configuration to AUTO, it can be a little over-aggressive in its timings. Try manually setting the Mem...
Was a while ago, working at my old job. Was back before Mobo's correctly recognized harddrives bigger than 2gb without a drive overlay software. Anyways, I goto replace VP of Finance's harddrive, and long story short, I formatted his 13 years worth of crucial financial business data buh-bye. I...