Mini DVI to TV flickering issue

I have 3 different Mini DVI dongles - one to S-video, one to VGA, and one to DVI. All are apple branded.
It's been a while since I last used the first two - the DVI one is brand new.
I recently purchased a 1080p TV to use as a second monitor. When connected using any of these dongles, the picture on the TV flicker's intermitintley. I've tried using different video cables with each dongle and have tried hooking the MacBook up to another TV. The same issue every time.
It's an early 2008 white MacBook. I'm starting to believe the Mini DVI port is faulty. What are my options here to fix this? The computer will be replaced at some point this year, so anything over a $100-$200 repair is probably out of the question. Any suggestions?
Thanks.

If you go into Display preferences, is 1280 x 800 a selection option? If yes, what happens when you select it?

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    Message was edited by: pbeauverd

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    Message was edited by: Abram George

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