Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 31)

Mac mini (Late 2009) Symptom Charts — Startup and Power 31 2009-11-03
Noise, Hum, Vibration
Unlikely cause: enclosure, cables.
Quick Check
Symptoms Quick Check
Noise/Hum/Vibration
Buzzing noise •
Rattling noise •
Ticking noise •
Squeaking •
Verify that the vents on the bottom and 1.
back of the system are free of dust and other
obstructions that might inhibit proper airflow
through the system.
Launch Applications/Utilities/Activity Monitor.
2.
Determine whether an application or process is
consuming a high percentage of CPU bandwidth.
CPU intensive applications can cause the fans
to run fast in order to maintain the proper
internal system temperatures. If needed, quit the
application or restart the system to resolve the
issue.
Eject optical media from optical drive. Out of
3.
balance optical media can generate audible
noise. To resolve try a different brand of media.
For additional information jump to ‘ Optical Drive
Noisy’ symptom flow.Disconnect all third party
devices and confirm whether the odor is being
generated by the device.
Play sound sample at loud and soft volume
4.
levels to determine if the noise is caused by the
speaker or the amplifier circuit. Jump to ‘Distorted
sound from built-in speakers symptom flow for
additional information.
Go to Deep Dive.
5.