My zune 4g red will turn on and work when plugged into the charger, but as soon as I unplug it from the charger it goes off and I cannot do anything with it. I haven't tried to restore it, not sure how, please help.

Ifthe rechargeable battery is more than 3 - 4 years old then the battery could be wornout. Rechargeable batteries have a finite number of charge and discharge cyclesand will lose their charge capacity over time, i.e. won't charge to 100% andgradually the charge reduces until the battery won't charge up atall. ORThe battery shows a 100% charge but when the adapter is disconnected thebattery drops off to zero capacity in a very short time. Ifthe battery drops to an unacceptable charge level then the battery needs to bereplaced.