LCD problem. Hi sir.i really need your expertise..i'm using acer aspire 4530after i have installed

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Hi sir.i really need your expertise..i'm using acer aspire 4530after i have installed windows xp 2 , my lcd started to flickering randomly.Someitimes, it will automatically go to standby mode even when i'm doing a work.i have reinstalled windows several times but the problem still remainthis is my specacer aspire 4530nvidia geforce 9100M Gram 2 GBmicrosoft windows xp 2