After a wine spill and much logic board cleaning, I've got my Macbook so it starts up (chime, system log-in screen), but then it shuts off about 15 seconds in. A couple of times I've made it past the log-in to a brief glimpse of the desktop where it asked "Are you sure you want to shut down?" then did it for me. Tried a safe start, tried it without the battery hooked up -- same results. Does this sound like a logic board issue, or something with the keyboard? (Some keys don't work, so I know the keyboard's been damaged somewhat.) Thanks.