New Mac suddenly very noisy

Discussion in 'Mac Basics and Help' started by KatAMac, Jan 7, 2008.

  1. KatAMac macrumors newbie

    Jan 7, 2008
    I got a new Mac (my first :eek:) a couple of weeks ago. Loving it until this morning when I switched it on - it sounds like the fan is working overtime (though could be something else?)

    Any ideas on what it could be or how I can figure out how to fix it? Thank you :D
  2. Makosuke macrumors 603

    Aug 15, 2001
    The Cool Part of CA, USA
    It'd help to know what model specifically.

    Just about any relatively new Mac has temperature-based fan control, so the fans will (usually) only ramp up to full bore if the computer is hot. Full bore, however, can be shockingly loud--many people panic when they hear it for the first time.

    A kernel panic--basically a complete system crash (you'll usually see a message about holding the power button to restart in several languages)--will cause the fans to go to full speed to prevent overheating (since software control is gone), but you'd know if that's what happened.

    There are also programs that can adjust the fan speed or range manually--I don't suppose you installed any recently?

    I also assume you haven't added any hardware recently, but it's worth asking--if one of the temperature sensors broke or got messed up (which of course could happen even if you didn't add anything, but is rather unlikely), that might cause the fans to ramp to full speed.

    Most likely, however, is that some program is running that's running the processor hard, in turn generating more heat, and thus ramping up the fans. Open up Activity Monitor (it's in the Utilities folder in the Applications folder), and see what it shows under CPU use. If one or more of the CPUs is running at 100%, that'd be a sign something is running very hard--check the list of processes (sort by the CPU column to see in order of how much they're using) and see if anything is at near or over 100%.
  3. richard.mac macrumors 603


    Feb 2, 2007
    51.50024, -0.12662
    fan speed is often linked with cpu load. open up activity monitor and have a look. are there any apps or processes taking up more cpu load than usual? if its an app you know force quit it.
  4. KatAMac thread starter macrumors newbie

    Jan 7, 2008
    thanks for the replies. It is a Mac OS X

    I've checked the CPU load, and nothing is using more than 1.6%. The noise starts as soon as I switch on.

    I have just installed Quark 7.2 - could there be a manual setting to do with that?

    Yesterday arvo was hot, but the morning when it started was cool.

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