Mini DVI Port has stopped working

Hi
I am using a fairly new MacBook Pro 15".  Up until recently, the DVI port was working fine with an external monitor.
Now all of a sudden, it does not detect an external display at all.
I am using the Apple Mini DVI port adaptor and the DVI connection to the monitor.  (I have two similar monitors and my wife's machine works fine on both of them so I don't think its the monitor.)
Running 10.6.8
Anyone able to help?
Ta, Mark

They tested it with their cable and mine.  First off, they connected an external screen to the mini port.  With their cable and mine, they could not get the "detect display" to see the screen.
Then they rebooted the machine from an external drive/os and it immediately recognised the external screen.
So the diagnosis was that it was a software thing.  I asked them if they could refresh the drivers or clear the settings but they were pretty unhelpful - did not want to go there.  Basically they said rebuild the OS from the ground.
I find this somewhat frustrating as surely there is some soft settings that can be done without rebuilding.  Are there any "preferences" or similar types of things that I can delete out of the library file.....?  (I am not a Mac tech guy - I am a user.....).
Mark

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