I'm taking a look at it.
And your problem sounds like a hardware issue. It could be that your motherboard is going bad, or your GPU is.
Did you try your GPU on another computer? Does it work okay there?
You can also test your RAM
Take memtest. Run for 8 passes and test each stick in a know good slot for an additional 6 passes.
→ RAM - Test with Memtest86+
→ Guide to using Memtest86+ - Geeks to Go Forums