Mountain lion, Get a blank screen when wake up.

The problem started when i connect my Dell U2711
to flash 5870's displayport
The system works fine . When my pro sleep i can't wake display up.
(Get only blank screen). But system wake up fine
(i can use screen sharing to control my pro)
The problem gone when i connect To 5870's DVI port.
I started found this problem after installing mountain lion,
Doesn't found the problem with 10.7, 10.6
Help me please!

I had this problem last evening also.  Tried soft and hard reset.  No change.  The last video I had been watching on the plane I had paused and sworn to iPod to play some music.  I later tuned the iPad off and put it away.  When I later tried to resume the movie at my Hotel all I got was a blank screen...every time.  What I just did to get the problem resolved was to go to iPod controls panel played the paused song and then closed the iPod app.  Then went to Videos and now the video came back where I had paused it.  Tapped Done in the top left corner and now I have all my videos back for access.  This must definitely be a bug between playing videos and playing music.  I had never paused a movie and listened to music before.....should work for you.

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