Custom Computer Crashing

Hey everybody, this problem has been plaguing me for weeks. My computer will crash at random while loading maps, games, web pages, and windows. It only happens when loading, I don't have any trouble playing the game. The screen will turn black, or sometimes different colors with vertical bars. Any sound that was playing will continue playing for a few seconds. I do not get any error messages or anything unusual in the Event Viewer.

Here are my specs:
DVD Burner: SAMSUNG | SH-S222A
Hard drive: 250G|SAMG 16M SATA HD253GJ - OEM
Video card: VGA SAPPHIRE 100287VGAL HD5670 512M
Operating System: WIN HOME PREM 7 64-BIT ENG 1PK DSP
Motherboard: GIGABYTE|GA-MA785GM-US2H RT
Processpr: AMD|ATH II X3 435 AM3 R
Memory: 2GBx2|GSK F2-6400CL5D-4GBNT GSKILL brand
Power Supply: TT | W0070RUC 430W RTL
Case: TT|VJ60001N2Z BK RT
Netgear WLAN USB adapter

I've done the following:
Flashed the BIOS
Used one memory card at a time
Messed with BIOS settings related to memory like CAS latency
Turned off the onboard VGA
Left my case open with a fan on it
Reformatted the computer
Ran windows memory test, extended version with no errors

I had the PCI video card unplugged for awhile with no problem, but I didn't use it enough to get a crash.

Please, if you have any ideas please let me know. This is starting to become very frustrating.
2 answers Last reply
More about custom computer crashing
  1. Please list your system specs - it gives us a good place to start as well.
  2. OP editted to make the specs more obvious. On another forum, a Gigabyte rep suggested it is the video card.
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