Question about Apple iMac Computers & Internet

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I turned on my iMac computer and was surprised by a roaring sound. The fan is running and won't shut off. The comp still worked, but when I tried to play music the external speaker connection s

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I'd bring the iMac to the nearest Apple Genius - make an appointment first.

Posted on Dec 07, 2013


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SOURCE: connecting external microphone to imac g5

Get yourself a great little gadget called iMic. It's a usb connector that adapts to let you used your headset mic and the mac system os will recognize it very well. Works good .
Costs about 24 bucks or so..

Posted on Jun 21, 2009

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SOURCE: Power up IMac but screen blank, fan on, light on but no response

I have one doing exactly this at the moment. It had gone to sleep and the fans were going like crazy. I think it is a Motherboard failure (it happened with many G5 iMacs), this one has been replaced once already, and I can't actually get it to install anything. I'm taking it apart tomorrow to see what I can find inside. If I fond anything I'll let you know.

Posted on Aug 07, 2009

  • 1619 Answers


Go to the apple web site there are many write ups for screen and motherboard resets of the PMU. If not you mave have to send it in for service or find a local apple store to see if they can help.

Posted on May 15, 2010

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SOURCE: bose speakers with usb won't work with new iMac

This forum may be able to help you to zap the pram see

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Imac noise as a fan what can i do?

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Fan does not run, over-heats

Thank for contacting Fixya, I will be glad to assist you.

In such extreme situations like this, the very fact that you have taken your iMac in four times to either an Apple retail store or an Apple Authorized service provider and having those repairs/replacements performed still with no resolution, is a sign your iMac may actually need to be replaced.

From my experience as veteran Mac tech, if your computer has been repaired at least three (3) times and there is still no resolution to the issues it has been having, you should be able to get a replacement computer from Apple or one of its authorized service providers.

Given the extent of the repairs that have been performed, I would recommend you take this computer back to your local Apple store and find out what is needed to acquire a replacement iMac.

The main reason I am being so direct in this answer to you, is not only due to the number of repairs you have experienced on this computer, but also the fact that of those repairs/replacements, the iMac's main logicboard (i.e. "motherboard") was replaced, yet you are still experiencing issues with your iMac's fan not running and your is also still iMac overheating.

This is a genuine hardware issue for sure so this is the course I recommend you take. One additional point I also need to add however. I noticed you never mentioned that the Apple retail store or the Apple Authorized service provider checked, repaired or replaced the fan which stops running and causes your iMac to overheat.

That is one component you need to have checked by a Mac technician, only because if the fan is still not running, even after the main logic board has been replaced- that still constitutes the problem you are having is still relative to the hardware, not so much the software.

If you have more questions, please don't hesitate to reply back to this post.


-The MacTechTrainer

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Hello, sounds like the contactor coil is stuck which keeps sending power to the motor. Change out the contactor.

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When the CPU overheats then it will shut down (i.e. thermaloverload) and won't boot up again until it has cooled down. If this is theproblem is not fixed then the CPU will eventually fail.
A faulty fan causes the problem or the fan and heat sink assembly are cloggedwith dust.
Check the CPU fan to see if it spins freely, if not replace the fan.
If the fan and heat sink is clogged with dust the remove the dust and make surethe vents are clear and dust free. Use a can of compressed air to do this.

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take the PSU (Power Supply Unit) from a known working computer, preferable to be the same model and test with it. when you do so make sure you disconnect any peripherals e.g ( Printer, CD-ROM, Floppy).

Look closely at the memory bay for any bent pins, and test with one memory at the time.

Let me know if this is still an issue.


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