hello, just like the title says, comp keeps shutting down. i bumped it with my knee and about 5 mins later it shut down. when i turn it on it will sometimes start fine but will shut off after about 5 mins but most of the time now it wont get past start screen. i was able to get on the internet a few minutes ago but it shut off after about 2 minutes. what the hell?? i checked all wires and connections, re-installed gpu, soundcard, ram, and cpu. all connections seem to be correct. i just dont know why its doing what its doing. any help is greatly appreciated.