My macbook (2008 unibody, 2.4ghz, os x 10.6.8) will not stay asleep, and it restarts when I shut it down. For example, I'll close the lid, it will sleep, then wake a few seconds later, and eventually go back to sleep. After a few cycles of this, the CPU reaches over 80 celcius, but nothing indicative of heavy cpu usage in the activity monitor except for "kernel task." I guess this is because the fans have to keep shutting off when lid is closed. Of the things I've tried, the following have not worked: fiddling with all possible energy saver preferences disk utility repairs, even with the snow leopard install disc resetting pram and smc loading into windows 7 partition, same thing happens loading into my external HD, same thing happens loading into safe mode, same thing happens deleted everything in the LaunchDaemons folder turned off bluetooth entirely turned off airport turned off "Set date and time automatically" nothing plugged into USB tried with/without magsafe plug, with/without battery, same problems occur no errors returned with applecare's Techtool Deluxe ran every maintenance script I could: crons, clear cache, rebuilds, updates PleaseSleep app doesn't work I've studied the messages in Console.app like my life depended on it and the only thing that's bugging me is that I get "kernel---------Wake Reason = ". It doesn't give me a wake reason, it's just empty. I can't find anything around the net that could tell me why this occurs. I put "syslog |grep -i "Wake reason ="" into the terminal.app and apparently this has been happening for a week now, hundreds of instances of no wake reasons. Could this be a hardware error?