Hi All, I changed my graphics card from 64mb to 128mb inno3d and it worked fine. I then upgraded my onboard sound with a 5.1 sound card (Hercules) and everything worked. When I next booted up, the graphics card failed as the monitor registered no pc signal. It booted past the windows xp booting process and just before the welcome screen came on, it stopped. I have tried reseating the card several times but no result. Changed it back to the 64mb and it worked. I then installed the 128 in my other pc and it worked fine. What's up? PC P4 2ghz,80gig,768ddr,550w psu. Can anyone give me some clues? Please?