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MacBook won't detect external display

My MacBook running 10.5.8 will no longer detect an external display. In this case, it is my Panasonic Viera plasma TV. It used to. Now it has simply stopped. The cables are fine and will connect my spouse's computer without issue. This is NOT a case of no display after sleep, etc. I have restarted, shutdown, switched to HDMI2 from the HDMI1 port. I have downloaded all updates...

Is there a "reset" for the mini DVI port? With my old powerbook I had to reset my external audio with a paperclip quite often. Anything anyone?
 
sad I’m frustrated
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