monitor goes into standby mode as soon as i get to windows login screen then i have to reset pc and go into vga or safe mode, im useing a ati 9700pro on cats 6.7 i have tried 6.8 and 6.9 also but same problem, once i reboot into vga mode or safe mode its all ok, then back to windows its usually all ok, only seems to happen when i shut pc down off overnight completely, when i get into windows its ok all day for every thing inc gameing, a very strange problem really, all was fine until a few days ago any ideals ? thx