iPod Nano 7th Generation will not turn on

My 10 month old iPod Nano 7th Generation will not turn on - all of a sudden.

All songs on the device have disappeared.

Shows in iTunes - even shows as having a fully charged battery.

Holding Home Button and Sleep/Wake button down, even for a long time, doesn't help.

Have changed USB ports, from computer to AC powered USB charging station.

Help?