Are These Vertical Running Lines on the iMac's Screen Normal?

Hi. Is this normal for an LED LCD such as those found on Intel iMac (specifically the late 2009 model)? It's very visible on the very dark gray background and it runs from top to bottom on both sides of the screen (the distances are symmetrical though). If it's not normal, what's this problem called and how's it fixed:
http://vid57.photobucket.com/albums/g230/alvin777/RunningVerticalLinesOnScreeniP hone_zpshofogydk.mp4
Thank you.
God bless, Rev. 21:4

Do a Safe Boot and see if you still see them. If you do, it's most likely a problem with the screen, which will need to be replaced. If not, it's probably an issue with the video card (GPU). Either way, not cheap, but fixing a GPU (Graphics Processor) will most likely require a complete logic board replacement--more expensive than the screen.

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