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If your laptop appears to boot up and the hard disk LEDflashes, then the problem is probably a back light fault. This can be a faultyinverter or a faulty CCFL lamp. Please click on this link and follow myinstructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
the moment you power on your system strat tapping F2 key
you will get a system setup screen if you dont get it as suggested before connect an extrnel monitor then press and hold Fn key and while holding it down press F8 it will toggle the display
if you get a video on external monitor LCD needs to be replaced
if you don't then its either systemboard(if video card is integrated)
or the video card
provide me your system's service tag located at the bottom pannel of your system, turn it upside down you will find a bar coded sticker which has a 7 digit alphanumeric number
i will be able to provide the best resolution