While, you could have a defective card, you should try reinstalling the ATI drivers
. I would suggest the following steps after downloading a program called Driver
Sweeper (Google search): –
1: Go to your control panel and uninstall programs. Find the driver and uninstall it.
2: Restart in safe mode and run Driver Sweeper, and sweep out the ATI driver section
Normally you should not need to use driver sweeper, but given your issues and to eliminate any corruption in the originally installed drivers, I would strongly suggest that.
4: Install new drivers.