I use a VGA cable, but it doesn't include sound, but my laptop is right behind the TV, so the internal speakers of the laptop are fine for things like BBC iPlayer repeats. To connect for sound I would have to select another input location on the TV - and I can't have two.

Tried with a HDMI cable, but for whatever reason, it didn't seem to want to work - I will probably reinvestigate at some point.

Another possible option is S-video, plus sound, if you have those connections. I have an old (tape) video camera which came with a 3-way connection cable (yellow for pic. and red/white for stereo sound) which plug into a Scart plug with the S-video - which then connects to the TV .... but I've never tried this (just the S-video cable alone).