I purchased an early 2011 MBP a few months ago, and recently it's been giving me some trouble - if I allow the battery to die, it will not turn back on after I plug it in and charge it up. SMC reset does nothing, nor does holding the power button - however, what I've discovered is, if I open it up and disconnect the battery for a few seconds, then plug it back in, it still won't turn on - until I plug it back in, then it comes right on with the first press of the power button. What could be causing this? Bad battery? I try not to let it die now, but I've had to do this whole process three times now (and lost a screw somewhere in the midst of it all) and I'd really like not to have to do it again. Any ideas?