Soooo My macbook pro unibody (a year old) has this problem. When its unplugged from the wall, with a full battery obviously, it works fine. Except if I lightly tap the computer, especially where I put my left palm when typing (above my ssd drive I think) it turns completely off. However, when the computer is plugged in, i can tap the computer as hard as I want (not too hard ) and nothing will happen (it stays on). Anybody with advice? I'll love you forever!!!