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Reducing fan noise for the iMac G5 (built-in iSight)
We've recently received reports indicating that resetting the SMU on iMac G5 (built-in iSight) systems can significantly reduce excessive fan noise.
In order to perform an SMU reset on the iMac G5, use the following steps:
- Turn off the system
- Unplug all cables, including power
- Wait 10-30 seconds.
- Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
- Let go of the power button.
- Press the power button once more to start up your iMac.
MacFixIt reader Steve Martarano writes:
"I suddenly had a real problem with fan noise on my 20-inch, first- generation iMac. I was having some major startup problems that were finally fixed by doing an archive install, but the fan noise was worse than ever, and it started as soon as I hit the power button. It was still there 24 hours later, after the iMac was off that entire time. So I reconnected every plug, including the iMac power plug, and that did the trick; no more noise."
Feedback? Late-breakers@macfixit.com.
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