Wirelessly posted (Mozilla/5.0 (iPhone; U; CPU iPhone OS 4_3_2 like Mac OS X; en-us) AppleWebKit/533.17.9 (KHTML, like Gecko) Version/5.0.2 Mobile/8H7 Safari/6533.18.5) So I turned off my MacBook and put it in my bag, then went to sleep. Today I take it out of my bag and it's about 35-40C within the bag. The laptop itself is cooking around the same temperature... Only it won't turn on! I've no idea what could have caused it to continue working overnight like this. When I shutdown I closed the lid and popped it in it's case, with the assumption that it would shutdown (it had already closed my user session) as it normally does. Anyone have any ideas? EDIT: Thanks for the quick reply guys. Just to clarify, it turns on now. The problem was obvious after a while - no battery. So the problem lies with closing the lid while shutting down - something which most people would have a habit of doing. I figured the OS would realize that most people don't want to sleep while in the shutdown process, but I think this may be an unintentional anomaly. Even if the laptop had slept, it would not work at full capacity and drain the entire battery. I think it was just a software defect. People have reported it here before: https://discussions.apple.com/thread/704971?threadID=704971 On another note, my time reset to 11am Jan 2001.