20" iMac - 1/2 display goes b&w?

2.16 Intel Core Duo 20" iMac
love it, for the most.
first issue I've ever had with the display.
we're using it as a home theater using the mini dv
out, connecting to an S-cable to the input of our
plasma tv.
so when I say 1/2 the screen...
my proper desktop has all my folders on it (on the left),
then when we use the telly, I'll open VLC (vid player of choice),
and move the video screen to the right, and it appears on my tv.
I'm sure there's a proper term for this, but I don't know it.
today for some reason, my desktop is color, but the "right hand" screen
is now B&W, and I've got no idea why.
Any help is appreciated. I'm also not the most savvy tech guy, so be kind...
Thanks for any/all help.
Bradley
<post edited by host>

Hello,
Check all the cables are secure for the connection to the TV. If you still have issues go to  menu > System Preferences... > Displays > and try changing the settings PAL/NTSC and frequencies until you find one that works well with your TV.
mrtotes

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20" iMac - 1/2 display goes b&w?

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