When I plug my Apple Powerbook into my TV using appropriate S-Video
cables, and click the option to look for displays, the Apple display
comes up in black and white on my television, while it remains in
color on the laptop.  Any ideas of how to fix this?  It used to work
fine.

Just in case, but I don't think this is part of the problem - my Apple
is from the U.S. and my TV is U.K.

THANKS!

Since you say you are using the appropriate S-video cable, the
following probably doesn't apply, but I thought I'd mention it anyway:

"Question: Why does my television only show images in black and white
when connected to the computer with a composite cable?

Answer: This usually means you are not using the S-video-to-composite
cable that came with your PowerBook computer. You are most likely
using an S-Video input cable. Use the S-video-to-composite cable that
came with your PowerBook computer instead."

http://docs.info.apple.com/article.html?artnum=58392