Loud fan, unidentified process in Activity Monitor

Discussion in 'iMac' started by Brookzy, May 6, 2014.

  1. Brookzy macrumors 601


    May 30, 2010
    Hi guys,

    Over the last month or so, the fan(s) on my iMac (mid 2011) have become noticeably audible. I doubt this is due to the warmer weather lately as I've not noticed this in previous years.

    In the Activity Monitor, a process by the name "Isof" (or, potentially "lsof" given that the I and l are, to my eye, indistinguishable in the OS X system font), periodically appears and is consuming 98% of CPU resources - but never stays put long enough for me to force quit the process. The whole time, however, overall CPU usage is around 12% while idling.

    Any ideas what this is? The sound of the fan is really winding me up...

  2. macthefork macrumors 6502

    Feb 2, 2013
    I believe that's an Adobe Reader Updater process.

    Try opening Adobe Reader, then go to Help > Check for updates, and install the update...

    See if that fixes it.
  3. Brookzy thread starter macrumors 601


    May 30, 2010
    Have updated Acrobat Pro, hopefully that will fix it.

    Thanks for your help. :)
  4. ilyasdesign37 macrumors member


    Apr 25, 2014
    i had this mac but sold it a few months, a very good iMac
    but last summer the loud noise of fan became too much over the months

    did take to apple but they couldn't find anything

    is a common thing among iMac for some reason!

    when summer past, the fan noise didn't come no more which was odd!

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