hi,my computer has suddenly been crashing to a black screen (everything else is still on) while im in the middle of browsing the web. i reformatted and tried system restores... they all worked until i installed my driver for the AMD gpu. after instaling the gpu and rebooting, i get to the log in page and will get a black screen again after seeing my desktop for a few seconds. i tried different drivers , 6800 series, catalyst omega, beta... all dont work. is there a driver specifically for 6870? whats gone wrong. hopefully u can help here please.