overclocking,set everything back to factory settings.
Download and install driver-sweeper
Download the most recent
software\driver for your ati AMD Graphics Drivers & Software Uninstall
ati software\driver,restart in safe mode
,run driver sweeper,choose only
AMD-Display and clean,restart in normal mode. Install
the new ati software\driver,restart. Update DirectX
Red very carefully
the instructions and run Video Card - Stress Test with Furmark
Post back here the results.