TS3533 Why is there a momentary black screen on my iMac?

While working on MS word documents, while organizing photos or while  playing a game I get a momentary black screenon my 27" iMac, during which time the mouse is inoperative......it only lasts a few seconds then returns to normal. I also hear a slight click from the computer after it has been running for a few minutes ( it sounds as if a relay is opening).

Something similar happened to me. 27" iMac, built mid 2011. Working on it and screen randomly went black. Apple replaced OSX twice (no difference), replaced graphics card (no difference), logic board (no difference), screen (no difference), power supply (bingo). Apparently there is a separate cable in the power supply that powers the screen. Replacing the power supply fixed my black screen problem... then I got a white screen problem and Apple replaced the iMac, but hey that's another story... so try your power supply.

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