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If your laptop appears to boot up and the hard disk LED flashes, then the problem is probably a back light fault. This can be a faulty inverter or a faulty CCFL lamp. Please click on this link and follow my instructions to identify the fault and possible fix :- http://www.fixya.com/support/r3598095-faulty_laptop_lcd_screen
remove power supply then remove battery.
then connect to power supply and try to boot, if no luck then remove power supply and press and hold power button on laptop atleast 10 seconds then in the same postion connect the power supply.
if still no luck then you should take a tour to service centre.
For any more question just ask me.
turn on pc enter bios setup select default settings save and restart.have os disk in drive wait for screen display any key to start from cd.press any key to load disk.in options select install windows ( not repair) your system will find existing os ,now you can choose repair or install fresh copy.if you choose to install fresh copy delete partition first and create new partition and format.