Ipod Touch is working only when plugged to a charger.
2 Important things:
- It works only with a wallcharger, not with a computer cable.
- I wouldn't like to go to a service because my warranty has expired.
You can try resetting it by holding down the home and sleep keys, past the power down, and until you see the silver apple logo. Let it reboot and then let it charge and see if it holds the charge. If it doesn't then your battery may have died. Afraid that isn't user servicable. You can either take it into an authorized repair place or you can take it to a third party repair shop. Using hte non-authorized place will void your warranty, but if your warranty is done like you said, then it may be cheaper and doesn't matter as much.