Apple MC408LL Apple Technician Guide - Page 34

Noise, Hum, Vibration

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3. Can the source of the odor be located using nose? Yes Replace affected module(s) P08 and retest system. No Contact Apple for assistance if you feel that there is a possible safety issue with the computer that has not been resolved in the previous steps. Noise, Hum, Vibration Unlikely cause: enclosure, cables. Quick Check Symptoms Noise/Hum/Vibration • Buzzing noise • Rattling noise • Ticking noise • Squeaking Quick Check 1. Verify that the vents on the bottom and back of the 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. Eject optical media from optical drive. Out of 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. 4. 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. 5. Go to Deep Dive. 2010-08-03 Mac mini (Mid 2010) Symptom Charts - Startup and Power 34

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Mac mini (Mid 2010) Symptom Charts — Startup and Power
34
2010-08-03
3.
Can the source of the odor be
located using nose?
Yes
Replace affected module(s)
and retest system.
P08
No
Contact Apple for assistance
if you feel that there is a
possible safety issue with the
computer that has not been
resolved in the previous steps.
Noise, Hum, Vibration
Unlikely cause: enclosure, cables.
Quick Check
Symptoms
Quick Check
Noise/Hum/Vibration
•
Buzzing noise
•
Rattling noise
•
Ticking noise
•
Squeaking
1.
Verify that the vents on the bottom and
back of the 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.
Eject optical media from optical drive. Out of
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.
4.
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.
5.
Go to Deep Dive.