To start off, this was a previously water damaged computer. When I got it it turned on and worked fine, but I disassembled it and cleaned the mobo anyway, there was only one spot with noticeable corrosion, and the entire backside of the mobo was clean. It's been working flawlessly for 6 months. Today I closed the lid and left it unplugged for a few hours. When I tried to wake it there was no response. I took it home, plugged it in still no response to power. I reset Smc, the magsafe light flashed green, still no response. I have also tried reseating the keyboard ribbon cable and shorted the power pads with ribbon cable in and out. Nothing. The only other weird thing is that the magsafe light is still orange but it's been plugged in for hours. Any ideas to try would be helpful.