Check this out:http://www.youtube.com/watch?v=gkP5KiCS9fE
With laptops, some of the time the issue lies with the cable that connects the mobo to the display. The short circuit makes the laptop start but doesn't give out any beeps even if u remove ram, hdd, etc. So ... it might be worth to disconnect the cable and try with an external monitor to see if there's any change.
Best of luck