Got a 21" Hitachi Monitor(1995!!), with Radeon8500
graphics+XP pro. Was getting very good display until AOL/BT shut down my BB connection. Had to install a 56k modem internally, and all this week I have been getting your problem. At first it was transitory, but having got BB back, tho removed modem,still rubbish display. Suggest checking the card isnt loose-mines very wobbly. If u are fortunate to have a 2nd AGP slot on your MOBO, try using that. try disabling the card and rebooting. Windows XP will also recognise it & use its own driver if u choose to delete the ATI driver as another step. Try shutting down with largest noxno display, then reduce after reboot. Remember YOURE THE BOSS!!!