Just got this from carphone warehouse's site
"Ipod's
If an ipod develops a fault you should try trouble shooting the problem first by visiting
www.apple.com or calling Apple Technical Support on 0870 876 0753. If the fault is confirmed and the ipod is less than 28 days old, it may be exchanged or refunded. If the ipod is more than 28 days old, you must arrange a repair with apple through the website or by calling the number above"
THIS is a page about ipods not turning on
And
THIS is apples support page for ipods
Hope these help