What part of my computer is broken?

liamorocks

Honorable
Jul 14, 2012
23
0
10,510
It all started a few months ago, I dropped a weed grinder on my graphics card and from that day on I had been having crashing problems etc... then my hard drive failed. So I got a new graphics card and a new hard drive, everything has been working fine. no bsod's or crashes, except for when I try to play a game such as BF3 or arma 2. Everytime I try to start a game, my computer just completely crashes and shuts down. It can't be the gpu as it has been replaced, so what could possibly be wrong? any way of finding out?