Fans come on while asleep

I am using a 21.5 iMac (bought in Nov 2009 I believe).
While asleep, the computer fans will come on after variable time intervals. I hit the power button and the fan goes off only to come back on. The fans run only at medium levels.
I do have wake on lan turned on but I have disconnected the Ethernet cable and turned airport off. When I wake the computer with the fans going, Activity Monitor shows no process going except Activity Monitor. The only peripheral attached is an empty usb-ipod cable.
Any thoughts?

Hi Lewis, Take a look at this thread: http://discussions.apple.com/thread.jspa?threadID=2307200&tstart=60

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  • PB gets HOT while asleep

    Hi all,
    I'm sure this question has been asked before, so please forgive me ahead of time if this is a repeat. I've been doing some searching around the web on this, and I was able to find plenty of people asking questions about this, but never any solid answers.
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    Hi, ggarthe. You have quite an odd problem, and I'm not sure what could cause it. The Powerbook shouldn't be able, let alone willing, to wake from sleep with its display closed and no peripheral devices connected, and doing so is certainly not good for it.
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  • Intermittent Problem - Fans come on full

    Hello Members,
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    3rd Panic
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    Interval Since Last Panic Report:  64783 sec
    Panics Since Last Report:          1
    Anonymous UUID:                    780984DB-855E-47E1-BEB5-7AE42F3E5F7A
    Fri Nov 30 08:20:43 2012
    panic(cpu 2 caller 0xffffff80002c4794): Kernel trap at 0xffffff80002af796, type 14=page fault, registers:
    CR0: 0x000000008001003b, CR2: 0x0000000000000000, CR3: 0x0000000000100000, CR4: 0x00000000000206e0
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    0xffffff82a5dbbe80 : 0xffffff7f8092021a
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    11G63b
    Kernel version:
    Darwin Kernel Version 11.4.2: Thu Aug 23 16:25:48 PDT 2012; root:xnu-1699.32.7~1/RELEASE_X86_64
    Kernel UUID: FF3BB088-60A4-349C-92EA-CA649C698CE5
    System model name: MacPro5,1 (Mac-F221BEC8)
    System uptime in nanoseconds: 9187389994944
    last loaded kext at 9138831405501: com.apple.driver.AppleUSBCDC          4.1.22 (addr 0xffffff7f80841000, size 16384)
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    com.apple.driver.AppleUSBCDC          4.1.22
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    Memory Module: DIMM 2, 4 GB, DDR3 ECC, 1333 MHz, 0x80AD, 0x484D54333531553742465238432D48392020
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    Hello Linc,
    Thanks for the confirmation.  I ended up removing the PCI card and uninstalling the driver.
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    Message was edited by: Ian Parkinson

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    Maybe a short circuit somewhere at the LCD panel that causes the PB becoming hot very soon. Was the LCD issue a warranty repair ?
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    1) There are lots of arguments about all kinds of esoteric questions and whether you should spin down the drive or not sounds like a good candidate. Drives do die of course, but in the greater scheme of things you and I are more likely to either replace the drive for something larger or replace the computer before that drive dies.
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