Apple LATE 2009 manual Noise, Hum, Vibration, Symptoms Quick Check Noise/Hum/Vibration

Noise, Hum, Vibration

Unlikely cause: enclosure, cables.

Quick Check

Symptoms		Quick Check
Noise/Hum/Vibration		1.	Verify that the vents on the bottom and
•	Buzzing noise		back of the system are free of dust and other
•	Rattling noise		obstructions that might inhibit proper airflow
			through the system.
•	Ticking noise
		2.	Launch Applications/Utilities/Activity Monitor.
•	Squeaking
			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 speakers symptom flow for
			additional information.
		5.	Go to Deep Dive.

2009-11-03 Mac mini (Late 2009) Symptom Charts — Startup and Power  31