i have a hp pavilion ze4700 and it was fine wen i last used it... but wen i turned it on this mornin, the screen was completley black! When it 1st comes on, it quickly flickers the 'hp' sign up in white then it stays black! I can just about see the menu bar if i look very hard!! but i literally cant use it as its so dark! ive tried the only thing i know...turning the brightness up, but that didnt work!! Would some1 be able 2 help? Please!!!