Mac Mini G4 with Panasonic 42" Plasma TV

I hooked up the TV using DVI-HDMI cable. Things worked fine for about 30 minutes. Now just a blank screen. Any ideas?
Thanks

What happens upon restart? Do you get any picture at all and then it is lost? Or does the TV never get a signal? During the 30 minutes it worked fine did you do anything at all like change any settings, download any software updates, anything at all?
A little more information would be helpful, and could help narrow down the options for you to try.

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