Weird horizontal white lines going across the screen

I've had my nano 4g for around six months. When I first bought it, there was a single white line going across the top of the screen. It never really got in the way, so I didn't bother exchanging the ipod. Recently, another white line of pixels appeared lower on the screen. This line is there even while I reset it.
Besides replacing the screen or exchanging the iPod, is there anything that I can do to fix this?

It may (likely) be a video card issue. There is a "known issue" with certain iMacs made in a certain timeframe (2011-12 I think), and one of the telltale symptoms is vertical lines showing up on your display. Go to Apple's website (https://getsupport.apple.com/) to find out how to get support, then either call their service line (they usually pick right up) or take it into your nearest store's Genius Bar. They'll first check if your iMac's serial number is on the list of vulnerable machines, and then they'll have to do a diagnostic to prove that's the problem -- if your serial number's on the list and it fails the diagnostic, they'll replace the video card for free, even if you're not covered by AppleCare (and if you are, it's free regardless).
My iMac just had this problem, there were lines sometimes and just weird display issues other times. Eventually it just grayed out altogether and I couldn't use it. So it's likely your display problems will worsen if you don't get it looked at.
It took them about a week to ship the new video card over, install it, and return the iMac to me.
Good luck!

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