Problems Viewing external Projector on Imac ISight

I have the new Imac iSight.
I was able to connect it to my HT using the apple DMI-Mini-DVI cable.
However the following day I turned the system on and my Imac is no longer recognizing my mini-dvi port.
I have checked System Profile and I don't see it listed.
No External displays are shown.
I have turned off and restarted all of the equipment in various combination, e.g.
computer-projector, or projector-computer etc..
Anyone knows how I can determine wether or not the problem is the port or something else.. ?
Thanks
SXM Borge
IMAC 20   Mac OS X (10.4.8)   Runco Rear Projector, using Mini-Dvi to DVI adapter

You will get more responses if you cross-post over in the iSight Forums where the iSight users hang out.

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