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Old 07-31-2008, 08:05 AM   #1
ktinkel
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Default Loud buzz from my iMac

I was just sitting here quietly typing a message when my iMac emitted a loud buzzing sound that lasted about 2 seconds, maybe 3. It really scared me — I thought the machine was dying, but everything seems to work all right.

The sound came from the frame of the iMac, which is where the power supply and hard drive are located. I had the volume control down to one pip, so this was definitely not a normal sound.

Should I panic? Arrange for service?

   
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Old 07-31-2008, 08:39 AM   #2
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Don't panic - just back everything up twice as frequently as usual.

Have a search on the web for new Mac prices. That sometimes brings machines back to their normal behaviour. If that doesn't work then get your Mac to search for Mac recycling websites. :-)

   
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Old 07-31-2008, 12:35 PM   #3
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Don't panic - just back everything up twice as frequently as usual.

Have a search on the web for new Mac prices. That sometimes brings machines back to their normal behaviour. If that doesn't work then get your Mac to search for Mac recycling websites. :-)
Ouch. You are not encouraging me!

It is less than a year old, and covered by AppleCare. Assume that would save me in case of failure. But I have never experienced anything like that before in more than 24 years of owning Macs.

   
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Old 07-31-2008, 10:17 AM   #4
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KT:

How is a an iMac cooled? Was a fan starting up in hotter weather?

   
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Old 07-31-2008, 11:19 AM   #5
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KT:

How is a an iMac cooled? Was a fan starting up in hotter weather?
Anytime I've had buzzing from a computer, it has been the CPU fan. Then, it may go away by itself, or happen at certain odd times, or get louder, or need replaced.

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Old 07-31-2008, 12:38 PM   #6
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Anytime I've had buzzing from a computer, it has been the CPU fan. Then, it may go away by itself, or happen at certain odd times, or get louder, or need replaced.
Thanks. It did sound like that.

I guess I will keep my ears open and, as Mike suggests, back up often.

   
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Old 08-01-2008, 03:46 AM   #7
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Thanks. It did sound like that.
Most often this occurs from dust settling on the fan. If you open the case and spray the fan with compressed air, chances are the problem is solved. (Once I used fire place bellows). However, I remember the post in the forum from the past, of the poster (I forgot his name, but I think he was from the Netherlands) who used a special oil on the fan bushings. That was interesting, but I still don't understand where to get the oil.

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Was that poster JVecht?? I just saw his name in the current visitors box.
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Old 08-01-2008, 05:24 AM   #8
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Most often this occurs from dust settling on the fan. If you open the case and spray the fan with compressed air, chances are the problem is solved. (Once I used fire place bellows).
Taking the iMac apart is no trivial matter, much recommended against. Among other things, you have to find a cushioned place to lay it (so the monitor is protected).

If anything like this happens again, I will call for service. Life is too short for taking iMacs apart!

   
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Old 08-05-2008, 03:30 PM   #9
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If anything like this happens again, I will call for service. Life is too short for taking iMacs apart!
Absolutely; I'd had a similar issue regarding a macbook - it's far better to connect with service pros

   
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Old 07-31-2008, 12:37 PM   #10
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How is a an iMac cooled? Was a fan starting up in hotter weather?
Not sure that it is. If it is, I would expect the fan to be running all the time.

I feel cool air drifting out of the bottom of the frame.

   
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