Ombré effect (bright to grey) on iMac screen

I've got a 27" iMac i7 - EMC2429.

When the machine is powered on, the screen has an ombré effect going on from bright at the right edge to dark grey at the left.

What is this and what can I do to correct it?

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Can you post some pics. Try a uniform color desktop or a large window with a uniform color.

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