Mini-DVI to HDTV setup not working right

Hi folks,
I have an iMac8,1 (24" intel with mini-dvi video port) that I am trying to hook up to my 50" plasma TV for surfing the web and looking at photos from the sofa. I've hooked it up with an apple mini-dvi to composite/S-video adapter with very poor results. As soon as I plug the adapter into the mini-dvi port, the iMac changes to a 4:3 aspect ratio at a very low resolution. The video is mirrored to the TV, again at a 4:3 aspect ratio and the resolution is awful. Text is all but unreadable.
I try switching resolutions from the display preferences pane, but nothing seems to work right. There are two display detected...the iMac and NTSC/PAL. Changing the resolutions on either of them don't seem to behave properly at all...everything just stays really coarse on the iMac no matter what, and the TV is horribly fuzzy. If I unplug the adapter from the iMac, the screen returns to 1920x1200.
Any thoughts? Should I be using a mini-DVI to HDMI for the video instead of the composite/S-video adapter?
Steve

Hello mmogie,
The problem is not with in the adapter. The quality on the external LCD or Plasma depends the most on the graphic cards. Thats that.
And in your case your problem is the mirroring, you will get really bad quality on the external screen because you are trying to mirror it with the one on our iMac and the Plasma screen supports different resolution then your iMac does so what happens is when you mirror it the graphics cards tries to find the middle ground ...
Now what you need to do is configure the plasma as extension not as mirror (Under Display Preferences>Displays ) select the second tab "Arrangement" and uncheck the mirror Displays.
So what the graphics will do is find you nice proper resolution for your imac and your Plasma separately and you will have good quality picture, and from there you can change the resolution to tweak it a bit more...
Now to take a step further if you want your Plasma to be the primary screen for your OS X and for you to have the dock on there, run apps and browse the web, all you have to do is from the "Arrangement" tab in the Displays Preferences just point the mouse on the wthite line and click and hold to "Drag and drop" it to your second screen "the Plasma" in your case and you will see how the dock and the task bar will show on the Plasma and you take it from there....
Sorry for the long explanation, I hope this helps. Please let me know.
Good Luck,
Goran

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