Im having an issue with my VisionTek Radeon HD 6870 1gb card. it seems to have a problem transmiting video to my 24 inch Asus 1080p monitor. but it seems to work just fine in crossfire with a different 6870 as the main card. im building another system so im going to keep the one good 6870 in my main rig and the other in a mobile rig. is there anyway i can get this video to work. it will run fine for like 2 hours then when i open up a youtube video it gets this blue screen with black thin line going from top to bottom. yet i can still hear audio for a 1min or so after this happens. Please help!