Apple iMac G5, 20-inch User Manual download pdf (Page 271)

iMac G5, 20-inch Troubleshooting - 47

Symptom Charts

No: If the fan activity does not coincide with CPU usage, the sound you're hearing

may not be fan activity. Go to the Next Step.

4. The normal functioning of the hard drive and optical drive will generate additional

whirring and scratching noises that may be audible. We can isolate these noises by

booting the computer to the iMac G5 Install Mac OS X Install Disc 1.

- Place the disc in the drive, and restart your machine, holding down the “C” key as

the machine starts up.

- Once at the Installer window, choose Open Disk Utility from the Installer Menu.

- Once Disk Utility is open, select your Macintosh HD and on the toolbar choose

Unmount. Note: if you have multiple partitions, you should unmount each of these

partitions.

This will spin down the hard drive. The optical drive will also be busy at this time; wait

a moment for the optical drive to spin down also and then listen to the machine.

Is the sound that you've been experiencing still present?

Yes: With the hard drive and optical drive inactive, all you should be hearing are the

fans in the machine. While booted to the CD, these fans should be running at a lower

level since the CPU is under very little task with both drives inactive. Fan sound that

includes objectionable ticking, whistling, or squealing may require further

investigation and/or replacement of the particular fan. Go on to the Next Step.

No: The normal functioning of the hard drive and optical drive will generate additional

whirring and scratching sounds that may be audible. All of these sounds are normal

and do not indicate a failure with your machine. If you wish to check the health of

your hard drive, see article 152349 - Replacing a disk before it fails.

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Apple iMac G5, 20-inch User Manual Page 271