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iMac G5, 17-inch Troubleshooting Symptom Charts
The computer may make a loud buzzing, ticking, or whining noise when it’s on. The sound
may vary depending upon screen brightness or processor load.
1. Determine that this noise is related to the computer by removing and shutting down all
other devices in the vicinity of the computer that could be causing a sound.
2. Determine if this is a power supply noise. With the iMac G5 on and running, adjust the
screen brightness by pressing the F14 and F15 keys on the keyboard. Does the noise
change in loudness when adjusting the brightness?
Yes
: The volume changes when the brightness changes, the noise may be related to
the power supply. Replace the power supply.
No
: If the volume does not change when the brightness changes, the noise is not a
power supply issue. Go on to step 3.
3. Quit all applications and test the computer again.
4. Check the volume settings under Sound in System Preferences.
5. Reboot the computer and check the computer again.
6. If the noise still doesn’t go away, contact Apple Technical Support.