Hi I've got on of the first unibody MBP15". My problem is that sometimes i have to leave it on during night when doing renderings for school. I think that I've tried everything to stop it from trying to shut down. Still just this morning it had the rendering stopped and wanted me to confirm a shutdown. I've tried the energy savings settings and such and I've tried searching various forums including this one - no luck. Hope you guys (/girls) can help me!