I just got a new computer today and when I run doom 3 after I play for a couple minutes the game will either freeze or crazy colours will go everywhere inthe game then itll freeze. i have a amd 3200, 2gb ram, 9800 pro. Could it be it is overheating? or that the power supply isnt enough (350 watt). If it is, how much does it cost to get more power? Thanks.