Q: Ipod Nano Screen not responding on Language selection

Just to be certain, have you double checked to make sure the hold switch located on the top of the Nano has in the active/On position?

If none of the 5 R's are able to resolve the issue, it's likely a hardware issue, meaning you'll need to have the iPod serviced/replaced either by Apple or a third party service.

http://www.apple.com/support/ipod/five_rs/nano2gen/

B-rock

Again, that's a pretty good indication of a hardware problem, most likely with the iPod's clickwheel.  Time to have the iPod serviced or replaced.

B-rock