How do you reset your ipod nano?

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/

Does it have a green line in middle of screen ??

Apple has some suggestions to try before taking it in to an Apple store. Most iPod Nanos are covered by a one year warranty, and you may have purchased a longer warranty. For questions about your warranty and coverage, call Apple customer service. If your iPod is still covered and you live near an Apple store, it may be faster to take it in.

Charge the iPod Nano for several hours to make sure the problem isn't a low battery. Force reset the iPod Nano by holding down the Sleep button and the volume down button at the same time for 8-10 seconds or until the Apple logo appears. Restore your iPod Nano by plugging it into iTunes and clicking on the iPod, then "Restore." This will wipe all information on your iPod Nano and install the latest version of its operating system. Re-sync your data to the iPod Nano after a restore.

The latest iPod Nano includes a locking feature, which allow users to set a four-digit combination to keep intruders from using the device. However, if you find that you forget what code you set on your iPod, you will need an alternate way of unlocking your iPod Nano. Once the device has been successfully unlocked, you can continue listening to music on it.

Plug the iPod USB cable into the bottom of the iPod Nano. Plug the other end of the iPod USB cable into a free USB port on a Mac or PC computer. Open the iTunes application by clicking on the Dock icon on a Mac or using the Start menu on a PC. Click on the name of your iPod Nano under the "Devices" list in the iTunes window. Click on the "Sync" button to establish a connection between your iPod and the computer. Click on the eject symbol next to your iPod's name after the syncing process has finished. Unplug your iPod Nano. The device will be unlocked and you will be able to access all normal features again. Hope it helps.

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.

Hi

Things You'll Need
iPod Nano Mac or PC computer iPod USB cable

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.

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.

Hi friend, Don't worry.. It is easy to solve your problem. Just follow these steps..

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. if you don't have itunes software, get it from here.

• 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
  .

If you still unable to solve the issue, click here to know more information
Hope it works.. Don't forget to rate me please..
All the best.. :)

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.
I hope this will help you...

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. Step 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. Step 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. Step 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.
   

this should help

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.

this should get ya going again

Hey,

try a reset I've posted instructions here
http://www.fixya.com/support/r561901-ipod_problems_start_5_solutions
Let me know if you need anything elsed.


Thanks,
Ekse