Ipod nano it froze after plugging into an usb socket

Unlock an iPod Model A1199
Although the second generation iPod Nano (also known as 2G) uses a four-digit pass code that prevents unauthorized access to your iPod by locking the screen, you can also unlock the device by plugging it into your computer's USB 2.0 port.
When the 2G iPod Nano is connected to the computer it is synchronized, and automatically unlocks the screen according to the official Apple site.
In order to successfully unlock the Nano it must be plugged into the primary computer used for synchronizing content.

Click "Start," "All Programs" and "iTunes" on your PC's desktop, or click "iTunes" on the Macintosh's desktop dock.
Plug the iPod Nano's cable into the docking port on the iPod Nano.
Plug the other end into the USB port on the computer to open iTunes.
Click "Controls" at the top of the iTunes' menu, and select "Eject iPod."
The iPod Nano's screen will be unlocked once it is ejected from your computer.

Manual Guide download
http://manuals.info.apple.com/en_US/iPod_nano_2nd_Gen_Features_Guide.pdf
Unlock an iPod Nano Code
With the latest iPod Nano model, you can set a four-digit code and lock all intruders from accessing your iPod.
In order to use the device's functions again, you need to enter the correct code.
However, if you happen to lose or forget the code, you will need to find another way to unlock your iPod Nano.

Plug the iPod USB cable into the bottom of your iPod Nano.
Plug the other end of the USB cable into a free USB port on your Mac or PC computer.
Open the iTunes program by using the Dock on a Mac or the Start menu on a PC.
Select your iPod Nano from the "Devices" list in the main iTunes window.
Click on the "Sync" button to make a connection between your computer and your iPod Nano.
Click on the "Eject" symbol once the syncing process is complete.
Remove your iPod Nano from the USB cable.
The iPod's lock code will now be reset and you will be able to access all features again.
Navigate to the "Screen Lock" option in the iPod menu to lock your iPod's screen again.
Since your iPod's lock code was just reset, you will be prompted to select a new four-digit code.


iPod Support
http://www.apple.com/support/ipod/

How to Unlock an iPod Nano Code
With the latest iPod Nano model, you can set a four-digit code and lock all intruders from accessing your iPod. In order to use the device's functions again, you need to enter the correct code. However, if you happen to lose or forget the code, you will need to find another way to unlock your iPod Nano.
Things You'll Need:
iPod Nano Mac or PC computer iPod USB cable
1 Plug the iPod USB cable into the bottom of your iPod Nano. Plug the other end of the USB cable into a free USB port on your Mac or PC computer. Open the iTunes program by using the Dock on a Mac or the Start menu on a PC.
2 Select your iPod Nano from the "Devices" list in the main iTunes window. Click on the "Sync" button to make a connection between your computer and your iPod Nano.
3 Click on the "Eject" symbol once the syncing process is complete. Remove your iPod Nano from the USB cable. The iPod's lock code will now be reset and you will be able to access all features again.
4 Navigate to the "Screen Lock" option in the iPod menu to lock your iPod's screen again. Since your iPod's lock code was just reset, you will be prompted to select a new four-digit code.

Connect it to your computer via the USB cord. You can also get adapters which will allow you to charge it using a wall socket (AC power). The adapter plugs into the wall, and then you plug the Nano's USB cord into the adapter.

once the battery dies completely...plug it to pc (itunes should pop up also) , when itunes comes up check for update of ipod it might need it....this shall stop the ipod from freezing up...have fun and enjoy

Try resetting the ipod while its connected to the computer by holding both the menu and center button at the same time for 6-10 seconds until you see an apple appear on the screen. You may need to repeat the reset. If this fails your looking at a hardware issue most likely. Good Luck.

Do the 5 R's:

These are for Nano, but they apply to all iPods:

Reset, Retry, Restart, Reinstall, Restore

Remember these five basic suggestions if you have a problem with your iPod nano. If

one of the following doesn’t help, read on for solutions to specific problems.

â Reset your iPod nano. See “General Suggestions,” below.

â Retry with a different USB port if you cannot see iPod nano in iTunes.

â Restart your computer and make sure you have the latest software updates

installed.

â Reinstall iPod and iTunes software from the latest versions on the web.

â Restore your iPod nano. See “Updating and Restoring iPod Software” on page whatever.

if you had lock on, it will freze up. if it was on lock here is how you can fix it. hold the center butten and the menu butten at the same time till the apple sighn shows up.

Plug it into your computer and use the link in itunes to restore your ipod. This will usually work. If it doesn't, then it is time to contact Apple support to cover your warranty, or take it back to the store.

Have you tried removing the battery for about a minute, then replacing it and trying to turn it on? Unfortunately, little things like this are great, but very susceptible to vibration.

Hope this helps, and please remember to rate my answer, good OR bad.

Good luck!

switch the hold button on and off, then hold horizontally, and push the menu button and center button at the same time. hold them down untill the ipod restarts and the apple logo apears. If that doesen't work, plug into the newest itunes program, and push restore.