Ok new system just got it done. Got XP on it and few games everything runs perfect. Now, if like i get up and the floor shakes it will just shut off (HARD SHUT DOWN) and if I like tap the top of my computer it will just shut off, and I'm talking a light tap!!! I just got it up.... Like havent even had it running for more than 1/2 hour and if I just set my finger on top of the case it will shut off HELP PLZ!