Sounds like it has an hardware or software clash and you could try these tips:
- Try resetting the iPod
Reset iPod touch: Press and hold the On/Off Sleep/Wake button and the Home
button at the same time for at least ten seconds, until the Apple logo appears.
- Next connect the iPod to the computer, if it shows in iTunes restore the iPod via iTunes
- Next see if placing the iPod in recovery mode will allow iTunes to see the iPod so it can be restored.