So I bought this custom built computer about 5 years ago, it's worked rather well--with sporadic issues here and there, but mostly very reliable. I decided recently to upgrade my graphics card, so I go and I order an XFX 6950, and when I install it, it doesn't really work. I check for old drivers, on-board driverc, etc. Everythings good, so I conclude it must be the card. So then I order another 6950, but this time from Sapphire, this one doesn't even post. So I think, this MUST be my computer--so I go to a very reliable local computer store and have them evaluate my problem, they tell me it IS the graphics card after running a Diag. on it. Okay, so I send that card back in and notice that the prices on all the graphics cards 69XX have gone up by 70 dollars due to the flooding in Taiwan. Well okay, whatever--I'll just go with a much cheaper 6850. I get this card and it works like a DREAM, it's beautiful and everything is going great till the day before yesterday when things started to get really finicky. My computer wouldn't display an image AT ALL, so I start having a minor panic attack. I switch back to my old card and make sure all drivers are off, apparently one of my games had installed a PhysX driver from NVidia, so I delete that. Anyways, switch back--no image. So I try flashing my Bios (My motherboard is an Asus PSN-E SLI) because I heard there were issues with display for this card unless you did that, so I did that. Yaaaay, it works--but not really. If I leave my computer on too long the image will drop, and I have to restart the computer, and sometimes an image won't show until I do multiple restarts. Also my mouse will come on, and then back off, and on again, and then back off--and my keyboard may not even register at all. What is going on with my computer?