Graphics adapters can be the source of these sort of problems, I usually over configure graphics adapters i.e. install more than I need, but on one system I talked myself into using a low end graphics adapter. After not much more than a year the machine would intermittently die - no blue screen, just turn itself off.
Long story short - since I threw out the low end adapter, and installed an ASUS GT640, the system has run fault free for over 2 years. It's now my development machine so I'm mainly running editors, browsers, compliers, IDE's etc. I usually have 8-10 programs running that I'm switching between, plus there are 20+ proglets on stand by in the tray. I had a suspicion at the time that running Word or Visio exacerbated the problem.
BR
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