Apple Mac mini Late 2009 (Technician Guide) - Manual (Page 76)

Mac mini (Late 2009) Symptom Charts — Mechanical 76 2009-11-03
Mechanical
Noise/Hum/Vibration
Quick Check
Symptoms Quick Check
Noise/Hum/Vibration
Buzzing noise •
Rattling noise •
Ticking noise •
Squeaking noise •
Verify that the vents on the bottom system are 1.
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.
Play sound sample at loud and soft volume
3.
levels to determine if the noise is caused by the
speaker or the amplifier circuit. Jump to ‘Distorted
sound from built-in speaker’ symptom flow for
additional information.