G72 won't turn on

I have a old g72 that will (after taking it apart) not turn on, all it dose is the power button light turns on and everything starts to turn on as usual but right before the screen turns on, the motherboard light shuts off and the only thing on is the fan and the power button. I have tried hard restarting it a ton and still nothing. Please help
 
My Suggestion: Open the laptop back up, Check that everything is properly connected.
Its always good to take a Few pics of the inside of the computer to make sure everything is back in place.

It could be as simple as a strip not pushed in all the way and the computer Faults.

HP G72 Notebook PC
Maintenance and Service Guide
http://www.hp.com/ctg/Manual/c02623152.pdf
 
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