ok I have a 8400 GS,2 gb RAm,1.9 ghz dual core AMD athlon,and only a 380 watt PSU. for a while everything was going great the games ran pretty well on medium settings ( not to put stain on the PSU/card it says only 350 watt minimum) until my new PSU arrived at my house. well I got bored and wanted to try it on ultra high for just 1-2 minutes to see how it worked ( then i put it back on mediu, settings, it ran wonderfully. but now every now and then the game will hang uop and freeze ( it was doind this before) but now more frequently. is there any way to ruin some diagnostics or have i just screwed up my computer.