Apologies if I'm stating the obvious, but you will need to try the different "AV" or "EXT" channels on your TV. The phono type inputs are normally number 3 or 2 (depending on the number of Scart sockets etc available).
Also check the device for switches - sometimes you have to specify the output type. If it came with an AC adapter, try using that rather than USB - some ports don't quite have enough power for certain items, or you may have too many USB devices plugged in. You could also try the PS2 connection if your lappy has one.
You'll also need to take care of the sound as in my previous post. You could use S-Video or an S-Video/Composite video and sound to Scart adapter such as
http://www.amazon.co.uk/Psylins-Scart-Adapter- Switchable/dp/B00077DC60/ref=sr_1_1?ie=UTF8&s= electronics&qid=1220470965&sr=8-1 (first pic I found - normally �1 from your local cheapo emporium) but only if you don't want to use the 3 phono sockets (admittedly, these are normally on the front, so it would at least hide them).
Finally, some laptops, even if you have set them to 2-monitor output need a bit more prompting. There's usually a Function (Fn) key that cycles between both screens/one screen/the other screen.
If none of the above works, post again - I can think of at least one more thing to try, but suspect that using the correct AV/EXT channel is what you need to do.