Black Macbook Overheating/Shutting Down

Discussion in 'MacBook' started by Shotgun OS, Sep 7, 2010.

  1. Shotgun OS macrumors 6502a

    Joined:
    Dec 18, 2006
    Location:
    Ohio
    #1
    Hey guys, over the past few weeks my blackbook has been shutting down more and more frequently from what I can only believe is overheating.

    I just checked my computer upon startup with SMC fan control - it starts up at about 70 C and at about 3500 RPM. Yet, after a few minutes, the fan immediately drops down to 1100 RPM or and fluctuates between 800-1400. I try to force the fans to spin with SMC Fan control, but nothing happens.

    I've looked all over the web and I can't find anything definitive. I know that macbooks tend to overheat. What can I do?

    I'm at college and I really need to find a fix for this as soon as possible. thanks.
     
  2. Pax macrumors 6502a

    Joined:
    Dec 12, 2003
    #2
    Could be a number of problems.....

    (a) 70 C is a bit hot for an idle Macbook. It should be more like 60 C or less. The overheat could be
    - runaway CPU process:- look in Activity Monitor
    - clogged fan
    - bad thermal paste:- iStat Pro will diagnose this, see below

    (b) 800 rpm is IIRC too slow for a Macbook fan. The fan should not IIRC go below 1500 rpm. Could be
    - clogged fan
    - failing fan

    As a start point I would suggest two things

    - reset your SMC http://support.apple.com/kb/HT3964. SMC controls fans among other things. It's a very long shot, but it can't hurt to try it.
    - downloading iStat Pro (free) and posting a screen capture of it on here. Then we can take a look. Take the screen cap when your Mac is completely idle (eg reboot it, leave it 5 minutes with no programs open, then take the screen cap)
     

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