オリジナル投稿者： Nathanael ,
Whenever I have had these symptoms with a MacBook it usually had something to do with flaky RAM or one of the RAM slots went bad (soldering) or liquid damage in the past, or dust in the slots obstructing the contacts when RAM is inserted... It could definitly be something completely different! But I might try insterting one ram stick in the lower slot then trying to power it up, then with the same stick try the top slot, and if this doesnt work try the same thing with the other stick of ram... If none of that makes it boot up properly then you just used the process of elimination to verify that the problem is not the ram sticks or the slots. Hope this helps!