DVI output problem

Hello,
I have a 1.83Ghz Core 2 Duo Mini that will not output any video over DVI.
I have connected the Mini via DVI to three known-good monitors (Apple 20in Cinema Display, Gateway 22in HD LCD, and an Acer 22in LCD) and can't get any video output. I get a startup chime, drive noise and a power light, but no video.
I have attempted to start the Mini in safe mode while connected to the Cinema Display but still can't get any video. I've reset the PRAM and PMU and that didn't help.
The Mini will display video using the Apple-supplied DVI-to-VGA adapter when connected to the Acer and Gateway displays.
When I took the Mini to the authorized service center, they said they couldn't replicate the problem. So I'm a bit stumped. Has anyone here had similar problems and/or solutions?
Thanks in advance for any advice you can offer.

I once had a similar problem. For testing I did not bother to screw in the retaining screws on the plug into the monitor. Could hve kicked myself when, after screwing them in, it worked fine.

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