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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
Shine a flashlight on the dark screen to see if you barelysee the icons on the desktop. If so, then the LCD Inverter is bad.
Plug in an external monitor and see if the display shows up on it. It can beany kind of monitor even the old big fat crt monitors as long as it has a vgacable to connect to your computer's vga port. If so that proves yourvideo card is ok. The video will show on most systems when you rebootwithout you having to do anything. Some systems will require you to hit the FN(Function key) + F1 thru F12. Hold down the FN key then hit the correctkey for displaying on the monitor (F1 thru F12). The correct key willnormally have CRT/LCD on it or it will have the icon of a display.
If you see no icons by shinning a flash light and the external monitor works,then your screen is bad. If you see no icons by shinning the flash lightand nothing shows on the external monitor, then most likely your video card isbad.
You say the trouble is with the keyboard. Can you attach an external keyboard via USB and see if you can push Fn key with F5 (I think it is the F5 key - try Fn with others - keep Fn pressed and repeatedly press the F5 or F6 etc.) several times to see if the screen toggles between LCD and external monitor. For this to work you will have to restart the computer after attaching the external keyboard. Press the start button until the computer goes off, and press again to restart.
Itf you ascertain that the trouble is with the 99.N7082.01D, make sure to try to fit it in correctly, or perhaps the Fn key has some dust or liquid in it so it does not function. Then you have to try to clean it from the inside after you disassemble.
This indicates a possible memory problem. Reseat the RAM modules and boot up, if OK then the laptop is OK.
If not then :-
If you have two RAM modules, remove both and insert one and boot up, if it is OK then repeat with the other one - this will determine which memory module is faulty.