Alright. Just got this MacBook from a friend. It's a 13" 2012 with the 2.5ghz processor. Here's where I'm at. It will only power up with the AC adapter plugged in. (Assuming the battery is toast. Shows green charged light, no lights via test button on the side) When I turn it on I hear the boot sound but get no display. Occasionally, it will flash a grey screen. It always momentarily shows the grey screen when I clear the NVram though. But that's as far as I can get. I have taken the bottom cover off and everything looks good. I have tried searching and nobody seems to have the grey screen pop up like mine. Any help would be appreciated.