Have a buzz/humm when recording...

Hi everyone,
compete mac newbie here....I am getting a buzz when I record in garage band. I want to use the built in mic. my son has a macbook too but there is no buzz when recording with his...I don't know if there is a setting I need to adjust....any ideas...

Does the hum happen when plugged into mains power?
I had a hum that was eliminated when I used the MagSafe Power adaptor supplied with my macbook instead of bypassing it and using the shorter lead when plugged into mains.

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Logic: When recording audio, a loud electronic buzz happens

I am using Logic 9 on an iMac.
I use Logic to transfer records and create MP3s.
The record player is connected to my stereo receiver, the receiver to the input of an MAudio FW 410, the MAudio FW 410 to my external hard drive, and my hard drive to my computer (I connected the FW 410 to the hard drive because the FW410 does not have firewire 800, so I connect the FW410 to the hard drive then use the hard drive's FW 800 to connect to the computer)
This setup has always worked fine until recently.
When I transfer my records, Logic stops recording after a few minutes in, and a loud buzz is generated, and I can see the wave form of the buzz where I should be seeing the input of the audio from the record.
I then disconnected the record player to see what would happen and to eliminate the possibility that the record player was the cause of the problem. With the record player disconnected, I still got the buzz simply by arming the record button on the Logic track.
Then I tried transferring the record into GarageBand. The same buzz happened simply by arming the record button in GarageBand.
There seems to be something going on with my computer in regards to inputting sound. I'm not sure if it's a setting in Logic/GarageBand, or if there is some larger computer issues causing the buzz.
Any ideas?

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Here is the Etrecheck report:
Problem description:
I am getting a buzzing sound when recording in Logic.
EtreCheck version: 2.2 (132)
Report generated 4/29/15 5:03 PM
Download EtreCheck from http://etresoft.com/etrecheck
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Hardware Information: ℹ️
    iMac (21.5-inch, Late 2009) (Technical Specifications)
    iMac - model: iMac10,1
    1 3.06 GHz Intel Core 2 Duo CPU: 2-core
    4 GB RAM
        BANK 0/DIMM0
            Empty
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            Empty
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            2 GB DDR3 1067 MHz ok
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            2 GB DDR3 1067 MHz ok
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Video Information: ℹ️
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Disk Information: ℹ️
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        Apple, Inc Apple Keyboard
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Firewire Information: ℹ️
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        East West Sounds (disk1s2) /Volumes/East West Sounds : 250.05 GB (84.41 GB free)
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        Videos (disk1s4) /Volumes/Videos : 250.05 GB (200.27 GB free)
        iTunes Music (disk1s5) /Volumes/iTunes Music : 249.30 GB (221.08 GB free)
    M-AUDIO FW 410 400mbit - 400mbit max
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    Apr 29, 2015, 04:52:21 PM    Self test - passed

Buzz on audio when recording and in playback - new mini mac?

Up until now I have been recording on a Macbook Pro, however I have recently moved onto a Mac Mini and that's when this problem started...
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Thanks for offering your tip... much appreciated. When setting Mono versus Stereo, are you referring to the little "circle" icons at the bottom of the channel strip, next to the "I" (input monitoring)?
I did have it set to mono, with a single meter in the mixer window channel strip and still had the right channel disappearing suddenly problem. Speaking of the mono/stereo circle icons, why is it that some channel strips show these icons but others don't? I have two guitar tracks that both play back fine, but one allows access to the mono/stereo select icon but the other doesn't display it. They're both identical in every other way.
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Hello all
I'm scheduled to work with a friend this week; I'm going to help him make a simple audition DVD. I promised him I had the necessary equipment and such.
I was importing from the webcam using iMovie. If I can't use my external mic to record for the video, there is more involved in the editing process. I was hoping to record the video and audio into one package. I'm using the built-in FaceTime webcam on my macbook pro and a ZoomH1 on usb.
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I just found using QuickTime Player to record a movie works great. I can easily change the audio input. iMovie is silly. lol
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Thanks
-Seth

Have a buzz/humm when recording...

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