OK, well i build a new pc and I am running xfx 4890 graphics card. What seems to happen is when I try to out minimize a game, League of Legends I would get a black screen and I would have to manually reboot my pc. I tried installing the new drivers and it fixes the problem but when I reboot my pc it happens again. So then i tried uninstalling my driver, booting my pc in safe mode and drive clean, then reinstalling it again. The same problem occurs. I haven't overclocked this graphic cards and left it on the settings it came with. If addition information is required, like a dxdiag file or something, please tell me? Also I already tried the 9.12 hotfix with it but the same problem still occurs.