Please check this question in Super User http://superuser.com/questions/439904/windows-7-ati-graphics-gpu-fan-speeds-up-when-display-goes-into-sleep-mode.
Please check this question in Super User http:// superuser. com/questions/ 439904/ windows- 7-ati-graphics- gpu-fan- speeds- up-when- display- goes-into- sleep-mode.