Is the laptop not displaying on the LCD or the external VGA output? If it is the LCD it may be the ribbon connector has come loose. If it is the external VGA connector then it may be a mobo issue.
yer grab a vga wire and try and wire it to your tv if it displays fine its proberly not the motherboard if nothing appears i think the motherboard is broken :-(
i wouldnt even know were to start when opening a laptop lol