Mac won't find external monitor

Hi there,
my old Titanium Powerbook connected seemlessly with my Samsung plasma TV with a DVI to HDMI cable.
However, my new Intel iMac, which I have connected with the mini-DVI to DVI adapter and then the DVI to HDMI cable , fails to recognise the TV. I have tried reconnecting several times and also, turning the Mac and the TV on and off at different times. Even restarting the Mac won't help. Searching for displays in Preferences doesn't work either. I can only assume there is something wrong with my connection. Please help.
Cheers
Intel iMac Mac OS X (10.4.9)
Intel iMac Mac OS X (10.4.9)

Bugsy6
Resetting the SMC can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so forth???
http://docs.info.apple.com/article.html?artnum=303446
Use these instructions for "Connecting a television to use as a display"
http://docs.info.apple.com/article.html?artnum=151827
Dennis
17" iMac Intel Core Duo 1.5GB Ram Mac OS X (10.4.9) Maxtor 300GB FireWire Creative Inspire 2.1 2G Nano

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