Pinpointing my PC freezing.

Once again, in the world of computers, I am stumped.

A few weeks ago, I took my PC to a friends house for some lan'ing and such. Unfortunately, loading my precious into my truck, I dropped it. The PC hasn't been touched much, mostly do to the fear of finding out how I destroyed my PC, MY SELF.

I have a dual core, E6700, Gigabyte GA-P35-DQ6 mobo, 1 gig of corsairs, Vista Home, an 8800 GTX, a cooler master 800 watt power supply. When I turned it on one of the first things I noticed was my gadget meter, the cores went wacky. They'd both spike to random numbers, the ram usage stayed the same as before. Not unusual sounds from the inside. No smells. Nothing. I used it for a bit and it froze. Music cut off and the screen stood still. It stays on for random periods of time and when it cuts out is usually random.
One things I noticed using programs like dream weaver, running COD:4, Crysis, basically all resource heavy applications, cause the crash to come sooner. I tried booting with multiple HDD, same result, the shut off time was a small variable. I unplugged CD drives, used IDE and Sata HDD, I switch RAM, I've done everything I can think accept try diff power supply or graphics cards.

That's about as much as I can dish out, anyone have any suggestions or tips? Thanks for reading this.