Apple MC408LL Apple Technician Guide - Page 83

Mechanical, Noise/Hum/Vibration

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Mechanical Noise/Hum/Vibration Quick Check Symptoms Noise/Hum/Vibration • Buzzing noise • Rattling noise • Ticking noise • Squeaking noise Quick Check 1. Verify that the vents on the bottom system are free of dust and other obstructions that might inhibit proper airflow through the system. . 2. Launch Applications/Utilities/Activity Monitor. 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. 3. Play sound sample at loud and soft volume 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. 2010-08-03 Mac mini (Late 2009) Symptom Charts - Mechanical 83

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Mac mini (Late 2009) Symptom Charts — Mechanical
83
2010-08-03
Mechanical
Noise/Hum/Vibration
Quick Check
Symptoms
Quick Check
Noise/Hum/Vibration
•
Buzzing noise
•
Rattling noise
•
Ticking noise
•
Squeaking noise
1.
Verify that the vents on the bottom system are
free of dust and other obstructions that might
inhibit proper airflow through the system. .
2.
Launch Applications/Utilities/Activity Monitor.
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.
3.
Play sound sample at loud and soft volume
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.