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That is NOT the backlight of the display, but the backlight of the keyboard, which can't be used, if the room is too bright. Cover the iSight/Facetime camera with your hand and with the other press the F5/F6 keys to activate the keyboard backlight.


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Have you tried an SMC reset yet?
Intel-based Macs: Resetting the System Management Controller (SMC)
 
Sorry yes Keyboard backlight - covering the camera has worked so I guess it's too bright (although it's the first time I've ever seen it happen and it rarely leaves this room!).

Thanks for the quick reply, I had no idea that a feature was that it would turn off so its good to know 😀
 
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