I have an iMac running 10.9.2 and sporadically the second monitor turns off then on. It's only off for a second or two. It's an Acer AL2216W. It's connected from display port to DVI.

  • Is it possible that the monitor is broken? – Hannes Karppila May 8 '14 at 18:18
  • I also think it's a problem with the monitor, it happens with my LG every once in a while and I think it's related to variations in the electricity. – Vinicius Pinto May 9 '14 at 4:17

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