system is 1.5 yrs old. dell vostro 400 intel core 2 duo @ 2.33 ghz, 2gigs memory, 256 mb gforce 8600 vid card. THE issue, dell has just replaced the vid card and im still getting lockups. However, im able to run the computer using the onboard vid card and i have no issues?? please advise whats going on. power supply is stock 300 watts..can this be an issue. Is it possible its the motherboard controller is not good or the power supply is not strong to run the vid card. thru speed fan utility i have a flame mark next to the gpu 58c...