No Screen on Notebook Compaq nC8000

Unfortunately, sounds like the LCD backlight or backlight power board is bad. If there is any warranty, lucky you. Otherwise you need replacement parts. The output voltage on the powerboard needs to be checked to determine what needs to be replaced. Backlight Approx $20, powerboard Approx $65. This is the cost for parts alone if you are into electronics, otherwise a repair shop would end up charging you $200 - $300. There is a slight possibility that it is only a loose connection (cold solder joint or loose cable), but the laptop would still need to be opened, Lots of luck