Hi, 2 weeks ago I bought a brand new computer, and the graphic card I chose was Sapphire Radeon HD 6850 1 GB, which seems like a big mistake. Ever since I assembled the computer I've had issues when trying to benchmark or play fullscreen games on it (mostly world of warcraft). The screen turns either black and a "input not supported" box is jumping around on my monitor. When this happens I have to do a hard restart. The weird part about it is, that the same game with exact same settings, runs often fine in windowed mode. Only when I installed catalyst 10.11 windowed mode also crashed, so I jumped back to 10.10e. The other scenario is when the screen freezes / turns black, i hit windows logo + L and If I'm lucky the screen wakes up and shows the log-in screen. When I log in again, I get the message "AMD graphics driver stopped responding and was restored". I've been troubleshooting and trying everything I could think of and a little bit more. I have: Installed latest drivers to everything, and tested different graphic drivers. Used Memtest86+ showing no errors, Disabling windows aero (thought it would work, since fullscreen actually worked for a while, but then the crashes came when i rebooted the system) <-- this was also interesting, because when It worked fullscreen I had only the original drivers, not any version of catalyst. Unfortunately this didn't work the next day. I haven't got much hair left on my head, so please help me! :bang: The reason I'm not RMAing the card, is because I'll have to wait for the reseller to test it (which takes 2-3 weeks) and if they don't find any hardware errors i'll have to pay them 50$ for the testing.