External display suddenly isn't working any more

Hello,
I have a MBP 13 (mid 2010) running OSX 10.8.4 conected with a Dell 1707fpt via DVI cable.
Everything worked fine without any problems until this morning and usually I have the MBP closed with an attached mouse and keyboard.
Since this morning the monitor no longer works on MBP. I therefore once connected my MBP to the DVI adapter and cable to another monitor (Samsung...) and it works. I also conected the Dell screen via DVI cable to another PC. It works as well.
Only the combination of my MBP and the Dell does not work! I put the adapter in the MBP and the MBP is just blue for a second and the internal monitor is functioning normally than. Unfortunately the Dell never wakes from sleep. I can only see the orange light (normal is green). Is there any solution? I've done PRAM and SMC reset.
Apparently all of the hardware works independently, only not together.
Oh and the monitor if it is connected does not appear on the MPB under "Monitors" ...
I was looking in some other communities and it seems that I'm not the only one with this problem, but no solutions found yet.
Do you have an idea how to fix this?

I am having similar symptoms using Lightroom 1.2 and CS2. I just updated to Lightroom 1.2 this week.
The first time I select edit in CS2 Photoshop launches fine and the image is transferred. If I attempt to edit a second image Lightroom hangs indefinitely on "Preparing the file for edit". Lightroom is dead at this point. Any attempted operation, including canceling the edit, just adds to the hanging stack. The only out I have found so far is to exit Lightroom, tell it to abandon all uncompleted tasks, and then restart it. At that point it will again work correctly to edit one image. It is the editing that causes the hanging, other functions performed after an edit do not (e.g. working in the develop module on a second image).
Lightroom 1.1 did not have this problem. The images I was working on were imported into Lightroom after I updated to 1.2. I am working under XP Pro and off of an internal (vs external) hard drive.

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