I have a (Diamond Stealths120) ATI Radeon 9550 256MB AGP version. I have had it over a year, and it worked after i got it. I could play Halo with the 9550 and not my older 8500. But for some reason i cant figure out, the 9550 doesn't work anymore. I have everything installed i need, new drivers too that my brother downloaded. But when i get into a game, say call of duty or brothers in arms demo, it just freezes, then the screen goes blank. Help please