I just upgraded my video card from a ATI Radeon 9200 128MB AGP to a PNY Verto Geforce 7600gs 512MB AGP. I tried playing some games but about a minute in they freeze up to the point where I have to restart the computer. At one point I was using the web browser (Chrome) and the computer beeped once and the screen went black, however the case lights and fans where still on. The computer was working fine before the upgrade. Specs: Windows XP SP3 AMD Athlon 64 3600+ Gigabyte K8nsc-939 motherboard 3GB DDR RAM WD 80GB IDE Harddrive Maxtor 200GB IDE Harddrive 2x DVD drives SB Live! soundcard Super Talent 450w Model: LC-8460BTX The only thing that I can think of is its not getting enough power. Is this assumption correct?