Why does the background on my 24" iMAC turn light blue?

I find that frequently the background on my 24" iMAC turns blue. This happens when using Word and Firefox. Any suggestions on likely cause?

I'm having this problem, too. At least it may be the same thing. What I've determined is the screen gets zoomed in somehow (accidentally repeated tapping?) this am it happened again while I was hitting snooze for the 10th time lol
Anyway, it's happened several times since buying the phone 2wks ago. The whole screen is water, but if I persist in sliding I can find images blown up. I always have to shut down and that's hard to do with the screen so large, because you can't easily get to the power off slide.
Is there something I can do to fix this or do I need to take it back?
Thanks

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Chipset Mo
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Bus: PCIe
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Device ID: 0x68a1
Revision ID: 0x0000
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Why does the background on my 24" iMAC turn light blue?

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