External display stays after removing adapter.

Hi!
After having my MacBook connected to my TV earlier this week (via the Mini-DVI->TV-out adapter) the computer won't stop recognizing the TV display.
When I unplug the adapter the screen on my MacBook flickers as if it is searching for displays and then returns to the same state that it had before unplugging the device (except there is no external display plugged in anymore). I have tried almost everything I can come up with, restarting the computer both with and without Mini-DVI-adapters, resetting SMC and P-RAM, connecting various external displays and disconnecting them again and so on. The only thing that remains (that I can come to think of) is to reinstall OS X, which is kind of the last resort for me since I have a lot of things to backup.
I think it might have something to do with the 10.5.4-update since it occured the first time using an external display after updating. Are there any ways to downgrade my system or do you have any better idea of what my problem is? Please help me!
I have a MacBook Core Duo 1.83 GHz (the first version) with Mac OS X 10.5.4 installed.

Yes, that's exactly my problem. It's kind of disturbing when you use spaces and they show you a much larger desktop than there really is, especially since it has been working for more than 1,5 years.
I just hoped someone knew some kind of fix that would solve my problem, anyone?

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