lines on my screen? how can I fix this

Hello Roni,

Thank you for the details of the issue you are experiencing with your iPod nano (6th generation). I have a couple of suggestions for the issue you are experiencing.

First, I recommend restarting your iPod nano, followed by a reset if the issue is not resolved. Use these steps to reset your iPod:

How to reset an iPod nano (6th generation)

Press and hold the Sleep/Wake button and Volume Down button simultaneously for at least eight seconds or until the Apple logo appears. You may need to repeat this step.

If the above step 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 while it is connected to power.

How to reset iPod

http://support.apple.com/kb/ht1320

If you continue to experience the same issue with the screen after resetting your iPod, I recommend restoring your iPod:

Restoring iPod to factory settings

http://support.apple.com/kb/ht1339

Thank you for using Apple Support Communities.

Best,

Sheila M.