Apple MD094LL/A manual Symptoms Quick Check Audio Microphone, M09

Audio: Microphone

Unlikely cause: LCD display, power supply, hard drive, optical drive, fans

Quick Check

Symptoms		Quick Check
Audio: Microphone		1.	Verify that no tape, sticky notes, or other objects
•	Microphone not working		are blocking microphone located on top of
•	Microphone audio garbled		computer near camera. Microscopic perforations
			on top of computer must be free of obstructions
•	No sound
			in order for microphone to function.
		2.	Go to System Preferences > Sound > Input.
			Verify that sound input device is set to internal
			microphone.
		3.	Go to System Preferences > Sound > Input.
			Verify that “Input volume” setting is set above
			minimum level.
		4.	Go to System Preferences > Sound > Input.
			Verify that “Input level” indicator moves when
			speaking into microphone.

Deep Dive

Check		Result	Action	Code
1.	Verify if boot chime is present	Yes	Go to step 2.
	when system is powered
	ON. Make sure audio output	No	Reset PRAM and retest.
	preferences are not set to mute.
2.	Make sure no cables are	Yes	Go to step 3.
	connected to external sound
	input/output ports. Go to
	System Preferences > Sound >	No	Replace audio cable.	M09
	Input and verify that “Internal
	microphone” is an available
	option.
3.	Go to System Preferences >	Yes	Go to step 4.
	Sound > Input and verify if
		No	Set “Input volume” slider to
	“Input volume” is set above
	minimum sensitivity.		middle position. Retest.
4.	Go to System Preferences	Yes	Microphone and audio input
	> Sound > Input and verify		functioning. Go to step 6.
	if “Input level” indicator
		No	Suspect bad microphone
	moves when speaking into
			connection. Reseat
	microphone.
			microphone connector on
			logic board. Go to step 5.

2010-09-09 iMac (27-inch, Mid 2010) Symptom Charts — Input/Output Devices  96