No picture when connecting iMac to TV via S-Video

We have an '07ish iMac, and an older TV with only composite and S-video.
We've connected a mini-DVI to video adapter, an S-video cable, and an audio cable, switched the TV over to the correct video input, clicked 'detect displays', and tried every single resolution. We got a little blip of white on the TV screen when we plugged the mini-DVI port in, but other than that—black screen. (We did get the sound.)
Thinking maybe *just maybe* we'd get a different result using a composite cable instead, we tried that too. Still nuthin'.
After reading through some other posts on connecting Macs to TVs, we tried restarting the computer. Still nuthin'.
Any help would be appreciated!
Here are the adapters and cables I'm using:
http://www.bestbuy.com/site/olspage.jsp?id=1181832624342&type=product
http://www.amazon.com/Belkin-PureAV-AV21100-06-6-Foot-S-Video/dp/B00026BTMK/ref= sr14?s=electronics&ie=UTF8&qid=1280379662&sr=1-4
http://www.amazon.com/Belkin-PureAV-Miniplug-Audio-Cable/dp/B00024VU5I/ref=sr116?s=electronics&ie=UTF8&qid=1280379812&sr=1-16

Hi eb
Welcome to Apple Discussions
Could be a bad Dynex adapter, return that one for another and/or cough up the extra $3 for Apples.
I'm now using a Mini-DVD to to DVI and a 21.5 LG monitor, but my Apple Mini-DVI to Video adapter and my 27" Sharp served me well for a couple of years.
See the Tip in > http://support.apple.com/kb/TA23844?
+Tip: To make sure that your iMac automatically detects the external display or projector, be sure you plug the adapter into the external display or projector before you plug it into the iMac.+
Dennis

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