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While connected to a power source, try to reset the iPod touch. Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until either the Apple logo or battery symbol appears. If the battery symbol appears, continue to charge iPod touch until it is fully charged.if still doesnt power on try this..Use the following steps to place your device into recovery mode. If the device is already in recovery mode, you can proceed immediately to step 6.
Disconnect the USB cable from the iPhone or iPod touch, but leave the other end of the cable connected to your computer's USB port.
Turn off the device: Press and hold the Sleep/Wake button for a few seconds until the red slider appears, then slide the slider. Wait for the the iPhone or iPod touch to turn off.
If you cannot turn off the device using the slider, press and hold the Sleep/Wake and Home buttons at the same time. When the device turns off, release the Sleep/Wake and Home buttons.
While pressing and holding the Home button, reconnect the USB cable to iPhone. When you reconnect the USB cable to iPhone, the device should power on. Note: If you see the screen pictured below, let the device charge for at least ten minutes to ensure the battery has some charge and then start with step 2 again.
Continue holding the Home button until you see the "Connect to iTunes" screen. When this screen appears you can release the Home button:
If necessary, open iTunes. You should see the following "recovery mode" alert:
Use iTunes to restore the device.
also maybe your unit have been in contact with liquid
You can tell if the headphone-jack Liquid Contact Indicator has been triggered by looking directly down into the headphone jack. Use a lighted magnifying glass or angle the iPhone or iPod so light shines down into the headphone jack. At the base of the headphone jack, you should see what is normally a white or silver-colored dot. The dot will become full or half red or pink when the dot has come in contact with water or a liquid containing water. To view the dock-connector indicator on iPhone 3G or iPhone 3GS, use a lighted magnifying glass and hold the device so that you can view the center bottom of the dock-connector housing. A full or partial red dot will appear if the indicator has been triggered. a feedback would be much appreciated