On my MPB, once the battery drains, it won't seem to work unless it's been recharged to a certain point, and that's WITH the charger plugged in. I'll have to wait 15, maybe even 20 minutes of it charging just so it will turn on or recover from sleep in this situation. So perhaps this is an easy problem to pinpoint if it's just a battery problem... but this certainly wasn't happening before. The battery could reach zero and shut off, but plugging it in would get the mac running again instantaneously. Now anymore. I was also under the impression that the mac will power up regardless of the battery level if ac is in? Why is it waiting on the battery? (it may also help to know that this only started happening after I was forced to do a fresh install after my harddrive directory was corrupted... I was able to reinstall so I assume what ever caused that corruption was not hardware based...) Thanks for any advice!