Odd 'shadow' type artefact on the screen. ONly in the 'black' or 'key'

I notice a ribbon shaped artefact roughly in the middle of my screen. It was only visible ata first agaisnt the grey background in iphoto.
So, I did a screen test- which turns to screen pixels to 100% red or blue or green etc.
The arefact was not visible at all on any of those test.
Only when the 'black' is tested, ie all pixels set to RGB (0,0,0) was it clearly visible.
Any idea what it might be? It is the only fault I can pick with the machine.

I remember way back when I got my first Mac I was using with a desk lamp on and I looked at the screen and thought there was a weird shadow in the middle. It turned out to be light shining through the Apple logo. Try covering the Apple logo with a folder or something and see if it goes away.

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