New iMac: Fog behind glass

Discussion in 'iMac' started by santaji, Aug 22, 2011.

  1. santaji macrumors member


    Dec 13, 2008
    Mumbai, India
    Hello. I got a new 21 inch iMac about two weeks ago, And i really like it but i have some questions.
    I noticed the sometimes after using it for a while, Some fog/condensation forms in that middle of the screen(behind the glass), Its hardly noticeable while using the computer, But after turning it off a large spot is clearly visible. After turning of the computer, The fog disappears in just about 10 or 15 minutes.
    I have only noticed this problem twice since i bought the iMac, And since the fog disappears quickly, I am not sure if i should be worried about this. Is this normal? Could it be because of the humidity/moisture in the air? The humidity in my city is at 90% right now, And there is a open window right behind the iMac. I'm really not sure if i should be worried about this problem.
  2. John T macrumors 68020

    John T

    Mar 18, 2006
    This sounds more than likely. Can you reposition your iMac further from the window? No doubt, in the position you describe, the fan is sucking moist air into the machine which is then condensing on the back of the glass screen protector.

    You could also consider a dehumidifier!
  3. talmy macrumors 601


    Oct 26, 2009
    When my father bought a new iMac three years ago, the screen was almost entirely fogged up! I called AppleCare and they said to just leave it on. And, of course, the screen cleared.

    In a very humid environment like you have, you may need to leave the iMac on all the time just to keep it dry.
  4. wxman2003 Suspended

    Apr 12, 2011
    The least of your concern is the glass. That high of humidity will take it's toll on other parts inside in the form of corrosion. Try and get a de humidifier for that room if you can.
  5. bushman4 macrumors 68020

    Mar 22, 2011
    Dehumidifier will not only alleviate your IMAC problem but will also protect your furniture etc in the room from getting ruined.

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