My MacBook Pro screen turns off when I open the lid!
This has been driving me nuts, and also apparently Apple as well.
When my MacBook Pro is connected to a power adapter, if I close the lid it sleeps like a good little Mac. When I open the lid, the display comes on instantly. Then after about a second, it goes black. The LED backlight turns off. I can get it to come on using either of two ways: 1) touch either of the brightness buttons, or 2) remove and replace the power connector.
Now, here is the weird part: it only seems to do it when I am logged in as me. If I login as guest, it doesn't happen. That would seem to imply it is something about my profile that causes it to happen. So I whacked ~/Library/Preferences and it still happened. So where is this particular bit of nastiness hiding?
MacBook Pro (15-inch Late 2011), Mac OS X (10.7.3), 500GB SSD, 8GB memory