I'm trying to find a solution to the same problem: my display won't wake after I put it to sleep (not the computer itself). The only thing that works (short of rebooting) is to hit ctrl-alt-del, which displays the menu that allows me to switch users, etc. Then I hit "Esc" and all is well. I've seen threads all over the Internet complaining of this problem, so we're not alone. Since my problem wasn't there when I first installed Windows 7, I suspect one of the updates started the problem, and M$ seems unwilling to diagnose it and solve it. One user thinks SP1 may be the culprit. At this point, I'm afraid there's no solution until M$ decides to fix it-- either that or it's hiding from us.