i have hp compaq presario cq42 450tu model laptop. when i was using windows 7 there was no problem in sleep mode but after upgrading it to windows 8 .. as i added additional ram from 1gb to 5gb... i am facing problem in sleep mode... whenever laptop moves into sleep mode and i try to start it again although processor and other things starts quite well but screen of my laptop doesnt turn on... please help
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