HP dv6810us - light turn on then comp turns off on startup. doesn't POST, etc...

I have my friend's dv6810us.
I try turning it on with the battery and the lights just go on for a sec then the comp turns off.
I try turning it on with the power adapter and the lights just go on for a sec then the comp turns off.
It doesn't go into an infinite on/off loop like the other laptops I've seen problems with. 
I've tried replacing RAM, hard drive, and BIOS battery to no dice.
The laptop is not under warranty. I assumed it was the nVidia GPU problem so I reflowed it and messed with a bunch of other things and got it to boot a few times...but it's not working anymore. I have yet to try reflowing again but I will if nothing else is suggested.
What would you folks suggest?
Thanks, chickeneaterguy

Nvidia GPU Repair
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