Mac heats up, fan running while asleep!

Discussion in 'Mac Basics and Help' started by m3774k, Feb 18, 2015.

  1. m3774k macrumors newbie

    Joined:
    Feb 18, 2015
    #1
    I took my MacBook pro out of my briefcase this evening after putting it to sleep, then driving home from the office. The fan was running, the mac was very hot and it had shut down automatically. I left it sitting on my counter for about 15 minutes before trying to restart. The fan ran continually and the case was very hot. I restarted it, it restarted ok and seems to be ok. Anyone ever experience this?
     
  2. Bomb Bloke macrumors regular

    Bomb Bloke

    Joined:
    Feb 12, 2015
    Location:
    Tasmania (AU)
    #2
    Simply put, your Macbook woke up while it was in the briefcase. With absolutely no airflow, it then proceeded to bake itself. Don't put systems into enclosed spaces while they're still powered on. "Powered on" includes sleep mode.

    As for why the system woke, there are a number of possibilities. A common one is an external Magic Mouse - it gets squeezed, its buttons get clicked, the system wakes.
     
  3. m3774k thread starter macrumors newbie

    Joined:
    Feb 18, 2015
    #3
    I put it to sleep every day when I leave the office - no Magic Mouse or external. Been doing this doe two years. First time it hardened. So I need to totally power down whenever I leave the office and take it home?
     
  4. Bomb Bloke macrumors regular

    Bomb Bloke

    Joined:
    Feb 12, 2015
    Location:
    Tasmania (AU)
    #4
    If you intend to place it in a near-airtight space for any amount of time, then yes, the system is best powered down before you transport it. So long as it stays asleep it's ok, but the problem is you never know when a system will decide to wake for no apparent reason.

    There will be a reason why it decided to wake, but it may not be obvious. For example, network sharing services can trigger a wake. Bluetooth devices can trigger a wake. Certain scheduled software tasks can do it. Odd drivers. Depending on the cause it can be quite a job to determine. It may even be that the system never fully went to sleep in the first place.

    If you take a look in Applications => Utilities, you'll find the Console tool. This keeps a log of many happenings on your system. If you check out the time/date when you believe the system woke, it may even give you some clues as to what happened.
     
  5. mw360 macrumors 65816

    mw360

    Joined:
    Aug 15, 2010
    #5
    I'm not sure if this is related, but I have an old 17" inch MBP which I recently upgraded to Yosemite. When I put it to sleep by shutting the lid, 50% of the time a similar thing will happen. At some point, I'll notice the fan is running at full tilt and the MBP is very hot.

    I'm not sure if my story differs at this point: The MBP won't wake from sleep in this condition and I have to power it off and restart.

    This happens regardless of the environment it's in, and started happening immediately after installing Yosemite.

    May or may not be the same thing.
     
  6. m3774k thread starter macrumors newbie

    Joined:
    Feb 18, 2015
    #6
    Waking up

    MW, mine is similar. I have 2 MBPr and they both do it. It all started with the last update. One is very regular - put it to sleep, 1:17 later, it comes on for 18 seconds. regular as can be - very 1:17. The other is very irregular. I put it to sleep at night, by morning, the battery, which was at 100% when I put it to sleep, is down to 30%. I don't put either in my briefcase anymore. I can't travel with either without totally shutting them down first. One MBPr is almost 2 years old. It has gone to sleep fine for all but the last month. I'm convinced the last update did something to cause it.
     
  7. mw360 macrumors 65816

    mw360

    Joined:
    Aug 15, 2010
    #7
    Well at at least yours will wake. Mine just burns up the battery or mains power until I switch it off.

    Are you running Time Machine? Does turning it off help?
     
  8. satcomer macrumors 603

    satcomer

    Joined:
    Feb 19, 2008
    Location:
    The Finger Lakes Region
    #8
    OS X: saving energy with Sleep article and OS X Yosemite: About Power final leading to the Apple article OS X Yosemite: Change Power Nap settings.
     

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