Internal speaker feedback to internal microphone

Our PowerBook G4 recently started to emit loud high pitch noise from the left speaker when one puts one's hand just above it or when playing i-tunes above mid-volume. It did not previously do this; not sure if it started after we did a software upgrade. It sounds like feedback from the internal microphone to that side speaker. This seems to be confirmed by plugging in an external speaker which causes the noise to stop. Can this be fixed? How does one turn the internal microphone off?

Unfortunately I have already been to the Sound control panel. Reducing the input level to the minimum is not low enough to prevent feedback once the speaker volume is above about 60%. As for switching to "Line-in" the option does not exist, the only option is "Internal microphone". However, I am quite certain that once upon a time that option existed. Again my most likely suspects are either an OS (10.5.8) or iTunes (9.2.1) software update, a hardware problem with the input jack (perhaps it disliked the impedance of a standard 3.5 mm TRS stereo plug microphone I tried to use), or a setting of the Audacity (1.2.1) sound recording software which I was experimenting with, which has removed the "Line-in" option from the Sound control panel.

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Mac Mini Internal Speaker and Airport Adapter

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To get this to work, you need to buy two things:
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Having a MBPr late 2013 and having a sound problem the sound does not come tom the headphones even its all the way up and when i remove the headphones it docent come out the internal speaker either ? any idea how i fix this?

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Hello. I've been able to play sound without problems through headphones or external speakers to date - the output always switched to these automatically until today. Now, sound output continues through internal speakers even if I plug in headphones or external speakers.
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O/S - Windows 7
[Personal Information Removed]
p/n# - rv220ua#aba
[hp dv6358se] Internal speaker plays sound intermittent(every 15s). CPU use = Max when audio driver enabled. CPU use = normal ranges when audio driver is disabled. Head phone jack only plays out of one speaker. Lastly when head phones are pluged cpu usage returns to normal. Is there a possible software fix for this issue?

snarfer,
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Does the new nano have an internal speaker like the touch?

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Message was edited by: 0Ari0

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iWeb is an application to create webpages with.
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My iPod Touch will not play through external speakers when it is docked. It only plays through it's internal speaker. All the other functions on the iPod can be controlled by the external speakers (volume,track, etc). How do I fix this?

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This is the Mac Pro desktop forum. I requested your post be moved to the MacBook Pro laptop forum.
Please move the MacBook Pro forum. Thanks
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Internal speaker feedback to internal microphone

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