IMac screen fading to black

Hello,
I have a 20" intel iMac and sometimes to screen will randomly fade to black and then go back after a few seconds. From what I can tell, it's harmless, but rather annoying.

Hello Barbbrown
First go to: Apple > System Preferences > Energy Saver > Sleep and try readjusting the time setting for Put the display to sleep when the computer is inactive for:
Then if the problem persist reset the iMac's SMC (System Management Controller) exactly as instructed in the following article. > http://support.apple.com/kb/HT1543
Dennis

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