I get just a few seconds of video on my HDTV before it goes black.

I have a Mac Mini G4 1.25 with a DVI output. I recently bought a Belkin DVI-HDMI cable, which I used to connect it to a Panasonic 42" plasma TV. It worked fine for about 5 minutes (with a little overscan, but hey) and then the image started to sort of ripple and ended up going black. When I reboot, I can see the booting process in the TV, but as soon as it's going to show the desktop the image goes black. It works fine with an LCD monitor using the VGA converter.
Any ideas? At first I thought it was the cable, but I find it odd that it consistently works for 1-2 minutes.
Thanks for any help.
Antonio.

Yes, this was a common topic on these forums back with the G4 minis were current. The problem has to do with an obscure detail in the mini's spec relating to digital video that says the attached display must be of the coherent TMDS type in order for DVI to work above certain pixel clock frequencies. You can read it here in the following link. Search that page for the word "coherent".
http://support.apple.com/kb/sp65
Probably your attached TV has a non-coherent receiver in it and the pixel clock is above 135 MHz for the timing being applied. The solution that worked in most cases was to use SwitchResX and lower the pixel clock to 135 MHz or less. That generally did the trick.

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