Hi there, My unibody MBP refuses to sleep. When I close the lid, (or make it sleep through menu bar), the screen turns off, but the computer keeps working. I've left it like that for 30 mins, and when I got back it was still working. And the worst part is that when I open the screen back up, the screen does not turn back on, and I have to hold the power button to restart. I've tried repairing disk permissions and no luck. Any help would be appreciated. thanks.