Thin Red Line

Hair pulling time.
About a month ago I got a new 27 inch imac. Sorry to say it 'played up' from the beginning, and had to go back to where I brought it. They replaced a faulty hard drive and a faulty memory card. Seemed fine when I got it back on Friday.
Until tonight. I was watching the BBC online player and noticed thin red lines moving with the action on the screen. Difficult to describe but my wife said it looked like one of the effects you'd find on a 1980's MTV video, though a little more creative.
Thought it might be the player, so I tried some MP4s & MV4s. Same red lines. Looking closely you can see them on the desktop pic as well.
Rebooted. No lines. But something's obviously not right, any ideas? I'll get back on to the Apple supplier tomorrow, but it's always good to have some suggestions from the people on here.
The best thing would be for them to give me a new machine, but apparently apple only repair if ten days have passed from original purchase. That's what I'm told anyway.
Thanks.

cstrav wrote:
Looking closely you can see them on the desktop pic as well.
Rebooted. No lines. But something's obviously not right, any ideas?
It could be the first sign of a bad graphics card, or it could be nothing. If it is the graphics card it will get progressively worse. You're on warranty for a while so no need to leap on it. If it's gone now that's good.
EDIT: It coud also be the RAM, even though they replaced it, it may not be properly seated.
Download and run Rember to test your RAM.

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Thin Red Line

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