Could this be a Mountain Lion problem?

Discussion in 'OS X Mountain Lion (10.8)' started by lugesm, Aug 20, 2012.

  1. lugesm, Aug 20, 2012
    Last edited: Aug 31, 2012

    lugesm macrumors 6502a


    Sep 7, 2007
    I have a 27" iMac connected to my Airport Extreme through
    an Ethernet cable. I am running up-to-date Mountain Lion.

    Whenever I leave my iMac for a while, and it goes into sleep mode, it recovers as soon as I touch the trackpad.
    However, I am no longer connected to the Internet, and nothing seems to work except a restart.

    When I get disconnected that way, I can enable WiFi on the iMac and connect to the Internet without restarting the computer, but the Ethernet connection does not recover until I restart the machine.

    I did not experience this Ethernet disconnect problem until I updated to the new OS.
    Does this sound like a Mountain Lion problem?

    Any suggestions ?
  2. d3b macrumors newbie

    May 27, 2006
    I have the same problem

    Software version 10.8.1 anytime that I allow my 24" iMac to sleep the ethernet is disconnected and the only way back is a reboot !
  3. lugesm thread starter macrumors 6502a


    Sep 7, 2007

    After a lot of investigation I found the following:
    1. After "sleep" the iMac running Mountain Lion WILL connect to the Internet . . . after about 15 to 25 second delay. This seems consistent. When I wrote the above post I had always given up after about 10 seconds.
    2. Having written the above, this is not the way it is supposed to work. This 15 to 25 second delay is unexplainable.
    3. I have contacted Apple Support twice (two different techs) and they don't have a clue.
    4. I have a MacBook Air running Mountain Lion over WiFi and it never experiences this delay.
  4. Macman45 macrumors G5


    Jul 29, 2011
    Somewhere Back In The Long Ago
    It's known, mine takes a few seconds to pick up the connection again, and it's Ethernet cabled
  5. ire macrumors newbie

    Aug 31, 2012
    Same problem-solved

    I had the same problem, lost connection to network and could not start any programs. Was going to do a clean install of ML. Read a post on a forum that some had problems waking hardisk after sleep mode, so I opened system settings-power settings and removed the option for letting the hardisk go to sleep. Now all may problems are gone, the screen goes to sleep but when I wake up the iMac everything works.

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