Does anyone know of a way to flash the screen without having the Universal Access option “Flash the screen when an alert sound occurs” turned on? I would really like to flash the screen without playing a sound too. So, turning on “Flash the screen when an alert sound occurs” and using NSBeep(); is out of the question. The only thing I have found that even mentions flashing the screen is Technical Note N2102 http://developer.apple.com/technotes/tn2002/tn2102.html it refers to the <OSServices/SystemSound.h> header, but that just looks like APIs for playing sounds there is nothing that indicates any of it would flash the screen. Any ideas?

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You could alter the screen’s gamma or create a partially transparent white window over the whole screen.

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Just do this:

FlashMenuBar(0); FlashMenuBar(0);

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Wow. Perfect, F**‘lashMenuBar(); is exactly what I was looking for. Thank you.

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Looks like the method is deprecated on Snow Leopard, alternatives?