I purchased the following computer.. http://www.bestbuy.com/site/cyberpowerpc-gamer-xtreme-desktop-8gb-memory-500gb-hard-drive/2541114.p?id=1219074174161&skuid=2541114&sellerId= and im stuck on figuring out what video cards are compatible. i have a radeon hd 5550 that i tried, and it fits in the slot thats available but nothing seemed to change and i tried loading drivers and the screen just blacked out on me until i removed it. I thought i read somewhere that the card above and below are compatible, but i cant find the webpage i was looking at, and i just dont know what i can get online somewhere thats compatible without having to send it back and try again. I dont do much gaming, i mostly am on secondlife which doesnt seem to like AMD products, so im looking at maybe an Nvidea card, im on a tight budget so trying to stay under 100 if possible. if anyone can help id really appreciate it. More complete computer info - http://valid.canardpc.com/1mud7d