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Hard Drive Fan Noise

2789 Views 3 Replies Latest reply: Jun 21, 2010 1:39 AM by scotlander007 RSS
polakbob Level 1 Level 1 (0 points)
Currently Being Moderated
Apr 26, 2010 5:58 AM
I bought a 21.5" iMac last November. There was a hard drive failure that required Apple to have to open the computer and replace the drive. Occasionally I walk into my office and hear my iMac fans running at full speed (sounds like a jet!). I've looked at Activity Monitor, but my CPU isn't running anything. I've also looked at iStat Pro's quick info on the system, and my fan speeds are:

Optical Drive - 999 rpm
Hard Drive - 5830 rpm
CPU - 1199 rpm

It's particularly disturbing when I wake up in the morning (as was the case today) and walk into my office hearing my mac sound like it's about to explode. Does anyone have any thoughts on what's going on or is it time to go to Apple yet again? Thanks!
iMac 21.5", Mac OS X (10.6.2)
  • garysisson Level 1 Level 1 (5 points)
    Currently Being Moderated
    Apr 26, 2010 8:36 AM (in response to polakbob)
    I believe the computer is trying to cool the hard drive, because of too much heat. From some of the threads I have read apple is having trouble with hard drives failing in these imacs. In my imac I don't think the fans ran enough and so I have had two hard drives fried.
    24 inch 3ghz intel imac, Mac OS X (10.5.7)
  • mweldridge Level 1 Level 1 (10 points)
    Currently Being Moderated
    Jun 9, 2010 12:26 PM (in response to polakbob)
    Just got a new i7 iMac 27" and I have exactly the same issue and HDD fan speed you show, It sounds like a Dustbuster at low speed. HDD fan speed starts out at about 2000rpm and after about 15 minutes the speed is up to 5830rpm as you are seeing. Been reading threads but haven;t found a solution yet.
    27" Intel iMac i7, Mac OS X (10.6.3)
  • scotlander007 Calculating status...
    Currently Being Moderated
    Jun 21, 2010 1:39 AM (in response to polakbob)
    I have had the same issue for several months. The Imac has been back to apple twice and the second time the temperature sensors were replaced. I have had 10 days with no issues and then today we are at HDD fan 5527 rpm. It is still spinning as I type. I have saved screenshots from Istat and Activity Monitor. I don't see any crashed processes that could be malfunctioning and CPU activity is 85%+ idle. I have a HDD temperature of 44 degrees and a CPU temperature of 45 degrees. These are very normal temperatures as far as I am concerned. Very frustrating.
    Imac 21, Mac OS X (10.6.4)

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