Soon as USB is connected to computer - It freezes up and will not repond until the ipod is reset, using menu and center button. Freezes up also, when IPOD Power Adapter is connected for charging battery. Have to use Travel Charger Model DAPPIPODTC01 Thru Docking Connector at bottom of Ipod to recharge battery. Ipod will play music as long as it is not connected to computer thru Docking Connector. Top of Ipod Mini connector will play music thru Headphones or ext. audio amplifier. Please let me know if this going to be major problem to fix (re: hard drive or main logic board problem)

no unfortunately this is a problem with 1-3rd gen iPod Nano's What i means is that the flash memory is starting to fail. If it freezes next time you can do this
1. Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.)
2. Press and hold the Menu and Center (Select) buttons simultaneously until the Apple logo appears, about 6 to 8 seconds. You may need to repeat this step.
Tip: If you are having difficulty resetting your iPod, set it on a flat surface. Make sure the finger pressing the Select button is not touching any part of the click wheel. Also make sure that you are pressing the Menu button toward the outside of the click wheel, and not near the center.
If the above steps did not work, try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep.
this is a soft reset and makes it easier then waiting till the battery dies.
If you need further assistance please feel free to follow up with a comment and i will be here to assist you. If this assisted you please feel free to rate the solution. thanks and have a great day.

Your best bet would be to do a soft reset of the ipod:

1. Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.)
2. Press and hold the Menu and Center (Select) buttons simultaneously until the Apple logo appears, about 6 to 8 seconds. You may need to repeat this step.

Tip: If you are having difficulty resetting your iPod, set it on a flat surface. Make sure the finger pressing the Select button is not touching any part of the click wheel. Also make sure that you are pressing the Menu button toward the outside of the click wheel, and not near the center.
If the above steps did not work, try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep.
To reset iPod, iPod (scroll wheel), iPod (touch wheel), and iPod (dock connector)

1. Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.)
2. Press and hold the Play/Pause and Menu buttons simultaneously until the Apple/iPod logo appears, about 6 to 8 seconds. You may need to repeat this step.

If this does not work then you may have to re-format the ipod in itunes. If you click on the ipod in itunes you should see a RESTORE option on the main page.

Have you attempted to reset the ipod yet?


Toggle the Hold switch on and off. (Slide it to
Hold, then turn it off again.) Press and hold the Menu and Center (Select)
buttons simultaneously until the Apple logo
appears, about 6 to 8 seconds. You may need to
repeat this step. Tip: If you are having difficulty resetting your
iPod, set it on a flat surface. Make sure the
finger pressing the Select button is not touching
any part of the click wheel. Also make sure that
you are pressing the Menu button toward the
outside of the click wheel, and not near the
center.
If the above steps did not work, try connecting
iPod to a power adapter and plug the power adapter
into an electrical outlet, or connect iPod to your
computer.

I would attempt putting the ipod into disc mode and see if your ipod is recognized by the computer after you reconnect it. I have researched this issue and found a knowledge base article on apples web site that may help you out with this.
Here are the steps to do it...

Putting iPods with a Click Wheel into disk mode

1. Before placing the iPod into disk mode, you should verify that it is charged.
2. Toggle the Hold switch on and off. (Set it to Hold, then turn it off again.)
3. Press and hold the Menu and Select buttons for at least 6 seconds until the Apple logo appears.
4. When the Apple logo appears, release the Menu and Select buttons and immediately press and hold the Select and the Play/Pause buttons until the Disk Mode screen appears.
5. Connect the iPod to your computer; the screen on the iPod will change and say "Do not disconnect"

If you are having difficulty putting the iPod model into disk mode, set it on a flat surface. Make sure that the finger pressing the Select button is not touching the Click Wheel. Also make sure that you are pressing the Play/Pause button toward the outside of the Click Wheel and not near the center.
If you are still unable to put your iPod with a Click Wheel into Disk Mode, use one finger from one hand to press the Select button, and one finger from the other hand to press the Play/Pause button.

If it won't go into disc mode while not connected to your computer, try doing the above steps with it already connected to you computer.
If none of these steps work, it is sadly probably time to get a new ipod. I hope that it does help you out though. Good luck :)

Have you tried to reset it, by holding down both the menu and center button until the apple sign appears? My Nano freezes and then it does I just reset it.

Hi
If it's an IPOD I found this solution http://www.apple.com/support/ipod/five_rs/nano3gen/#
This was the procedure for my 3rd generation NANO.
Step 1 has never worked for me but the reset has worked so far.
Hope this helps
Ann Mckay
Reset To reset your iPod:

• 1. Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.)
• 2. Press and hold the Menu and Select buttons until the Apple logo appears, about 6 to 10 seconds. You may need to repeat this step.
  Tip:
  • If you are having difficulty resetting your iPod, set it on a flat surface. Make sure the finger pressing the Select button is not touching any part of the click wheel. Also make sure that you are pressing the Menu button toward the outside of the click wheel, and not near the center.
  • If the above steps did not work, try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep.

Reset: hold center button and menu until apple logo appears.

After you eject if from the computer and it locks up press and hold the center button while pressing down on the menu button. This will reboot the IPod. What charger are you using? Is the charger plugged into a usb hub or does it get power from an electrical outlet?

try a reset when it freezes

To reset your iPod:

• 1. Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.)
• 2. Press and hold the Menu and Select buttons until the Apple logo appears, about 6 to 10 seconds. You may need to repeat this step.

Tip:

• If you are having difficulty resetting your iPod, set it on a flat surface. Make sure the finger pressing the Select button is not touching any part of the click wheel. Also make sure that you are pressing the Menu button toward the outside of the click wheel, and not near the center.
• If the above steps did not work, try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep.

Try resetting the ipod, this usually works. As follows: How to reset iPod To reset an iPod with a Click Wheel, including: iPod nano (3rd generation) iPod classic iPod (5th generation) iPod nano (2nd generation) iPod nano iPod with color display (iPod photo) iPod (Click Wheel) iPod mini iPod mini (2nd generation) Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.) Press and hold the Menu and Center (Select) buttons simultaneously until the Apple logo appears, about 6 to 8 seconds. You may need to repeat this step. Tip: If you are having difficulty resetting your iPod, set it on a flat surface. Make sure the finger pressing the Select button is not touching any part of the click wheel. Also make sure that you are pressing the Menu button toward the outside of the click wheel, and not near the center. If the above steps did not work, try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep. To reset iPod, iPod (scroll wheel), iPod (touch wheel), and iPod (dock connector) Toggle the Hold switch on and off. (Slide it to Hold, then turn it off again.) Press and hold the Play/Pause and Menu buttons simultaneously until the Apple/iPod logo appears, about 6 to 8 seconds. You may need to repeat this step. If the above steps did not work, try connecting iPod to a power adapter and plug the power adapter into an electrical outlet, or connect iPod to your computer. Make sure the computer is turned on and isn't set to go to sleep. If you are still unable to reset your iPod, use only one finger from one hand to press the Center (Select) button, and one finger from the other hand to press the Menu button. When you reset iPod all your music and files are saved, but some customized settings may be lost. Date and time is preserved (unless the iPod reset itself because it had no power and then was reconnected to power). Other customized settings, such as Bookmarks, On-The-Go Playlists, Shuffle, Backlight timer, and so forth are preserved from the last time the hard drive turned on. Good luck, and I hope this helps.