iMac goes into screensaver unexpectedly

Discussion in 'iMac' started by Sir Loin Steak, May 1, 2013.

  1. Sir Loin Steak macrumors 6502

    Sir Loin Steak

    Feb 2, 2009
    Why is this happening?

    Out of the blue, the screen goes black and i have to press a button to get the screen to come back to life.

    Screen saver is set to five minutes, but this happens with no warning while I'm typing etc.

    Other thing that has started happening concerns the mouse losing connection.

    Yesterday I got the warning about battery power, so I swapped in new batteries. Ever since, it has been losing the connection for about thirty seconds before re-connecting.

    What's going on? Machine is about four years old now.
  2. flynz4 macrumors 68040

    Aug 9, 2009
    Portland, OR
    Did you inadvertently set hot corners?

    System preferences > Desktop & Screensaver > Hot Corners


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