IMac no longer working with projector?

Hi folks,
I'm having a weird problem with my iMac (Intel dual core2 - White). All seems to have started going wrong after an upgrade to Leopard. The computer no longer recognises the projector. I know its the iMac cause it all works fine when I connect my Macbook. I'm using a MINI DV thing to VGA adapter.
I have done an archive and reinstall twice but still not working. When I plug the lead in the imac quickly goes to the blue screen as if its changing resolution but then just goes back to normal. System prefs doesn't recognise that anything is plugged in.
I have taken the iMac back to apple with the VGA adapter and 'sods' law it all worked fine! As soon as i get back to my school and re-connect it I get the same old problem! Is it a leopard fault or what? It all worked fine with Tiger?
I have reset permission/repaired the disk/ and zapped the PRAM. Anyone got any ideas?
Thanks
Chris

I'm having the same problem.
I've turned up for two presentations in the last week where my new MacBook Pro did not recognise the projector. It looks like it's going to work (i.e. the laptop display blinks and alters resolution), but nothing is sent to the projector.
At my office presentation, I managed to dig out my old PowerBook -- which worked fine (I have never, EVER had any problems with plugging displays or projectors into my PowerBook).
But when at a conference, I had to suffer the embarrassment of moving everything to a PC laptop (which buggered the transitions, etc.)
It looks like Apple has given up on the whole "it just works" thing.
Its weird -- I'm not used to not being able to rely on my Apple laptop working... It's a little stressful.
A

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