Similar problem
Hello,
I have the same problem, but it isn't a Lion problem cause I've always been with snow leopard in my Imac 27". Yesterday everything worked fine in my computer, and this morning when i turned it on, the screen stays black. I know the computer is running because i can hear it, and if i press the play button in the keyboard i can get itunes to play. I tried connecting an external monitor and it works, but because its not the principal one i can't get the preferences window to open or any window to open.
I also tried disconnecting the computers for a while, or booting it up holding cmd+opt+p+r, but nothing worked.
Anyone has any idea of whats is the problem or the solution?
Didz