I switch between locations. At the office I use an external display. Last night I put the MacBook Pro 15" i7 to sleep, then disconnected the display. This morning I woke up the computer at home (without external display), and something very scary happened: The screen was totally washed out and whitish. It's hard to describe, but the display was unusable. I tried turning up and down the luminance controls, and changing color sync profiles: Nothing helped. Put it back to sleep and re-awoke: no change. Finally I restarted the computer, and that fixed it. This has never happened to me in may years of using a Mac laptop. Any ideas?