The iPod Touch has a battery capable of up to 40 hours of audio playback, but depending on how you use your iPod, the battery capacity can vary widely. If you attempt to turn your iPod on and get no result, the battery could be fully drained, which you can easily resolve by connecting it to your computer to recharge it. If this doesn't work, resetting or restoring your iPod may get it working once again.
Charge Connect your iPod Touch to your computer using the USB cable that came with it and charge it for at least 10 minutes before attempting to use it again. If the battery is fully drained, the screen may remain blank for a few minutes after plugging it in, and then a low battery image will appear, indicating that you shouldn't unplug it for at least 10 minutes. Never plug your iPod into your keyboard, but rather into the computer itself. Also make sure your computer is on and not in sleep mode while your iPod is charging, or the battery may drain rather than charge.
Reset b> If recharging your iPod doesn't resolve the issue, reset it while it remains connected to your computer. Push the "Sleep/Wake" button and the "Home" button simultaneously until the battery symbol or the Apple logo appears. This takes about 10 seconds. Continue to charge your iPod if the low battery image appears after the reset.
Restore b> If your iPod Touch still isn't responding, restore it in recovery mode. First, place your iPod in recovery mode by disconnecting it from the USB cable, and then press and hold the "Home" and "Sleep/Wake" buttons simultaneously until the iPod turns off. Push the "Home" button once again, and continue to hold it while you re-connect your iPod to your computer using the USB cable. Continue holding the "Home" button while the iPod turns on and release it only when the "Connect to iTunes" screen appears. Open iTunes, and click "OK" when the recovery mode alert appears. ITunes will restore your iPod back to factory settings. You'll be able to sync it with iTunes to recover the data you lost during the restore, provided you have synced with iTunes in the recent past.
Check Liquid Contact Indicators b> All iPods manufactured since 2006 have built-in liquid contact indicators. If your iPod has been in contact with liquid, this could be the source of your problem. You can check whether the liquid contact indicators have been triggered by looking straight down the headphone jack on your iPod. If you see red or pink at the bottom of the headphone jack, your iPod has been in contact with liquid, and this is likely the cause of its malfunction. Contact an authorized Apple repair center to inquire about whether a repair is possible. Such repairs aren't covered under your iPod's warranty. iPod touch: Hardware troubleshooting
http://support.apple.com/kb/ts2771 iOS: Unable to update or restore
http://support.apple.com/kb/HT1808
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