MacBook Pro won't turn on/turns off when moved

Hello, I just bought one of these off of eBay with the description saying that it got the flashing folder. I open it up, and I couldn't get it to turn on! I've tried removing the drive, ram, and battery. I was able to get it to turn on after a couple smc resets, and even boot it to a USB, but it shuts off if I move it the slightest, and is difficult to get back on again. I will occasionally get a brief spin from the fan and a faint flash in the display as well. An interesting observation: when the charger is plugged in and the light is orange, the light turns green when I push the power button and goes back to orange when I release it, this is when it doesn't turn on. I'm trying to save it before I attenpt a return, as I got a pretty good deal on it. Edit: is this possible corrosion that could be causing it?