IMac screen edges are showing light

Hello
i just bought my imac today and i noticed while watching movie when screen goes black the edges of screen shows white light.
is this a fault?

I'm considering buying an iMac for the purpose of putting at the centre of a home cinema (amongst other things), and this was one of my questions too.
Have you thought of a physical low tech solution like draping a thick piece of cloth (maybe a bit of blackout curtain) over the iMac screen once you have the output going to the projector?
On a Window's box with dual displays, it is simple enough with most graphics drivers to output to only one screen or various other options. I'd have thought it was the same for a Mac. Hope someone else has a more informed answer.

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IMac screen edges are showing light

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