Hello, I had windows vista and everything was ok.Now I have windows 7 and screen, before log in start flashing/blinking.Sometimes restart helps.Sometimes I use laptop for few hours and is not blinking. Is something wrong with laptop(electronic problem)or with program windows7? Any advice? Somebody-...

Hello,

I had windows vista and everything was ok.Now I have windows 7 and screen, before log in start flashing/blinking.Sometimes restart helps.Sometimes I use laptop for few hours and is not blinking.
Is something wrong with laptop(electronic problem)or with program windows7?
Any advice?