BSOD after leaving the computer for an hour, error DRIVER_POWER_STATE_
My computer is facing BSOD after i left my computer for about an hour. It has happened twice. I think is something wrong with the driver but i not sure which one, please advice.
Computer age:2 years(Dell studio 14)
Os:Windows 7 home premium 64 bit oem
Processor:intel core2dua 2.53ghz
display card:amd ati 540v
Appreciate for any help, if possible can you teach me how to determine the problem? so that i can diagnose myself next time.