When recording, strange noises and audio cut offs

When i open garageband and record a basic track (no other programs running), randomly, a scratchy noise that kinda sounds like a distorted, heavy metronome, comes from the left speaker or left headphone.
This noise is not recorded, but comes out very loudly in the monitor.
Also, when recording a basic track, the output audio will completely shut off from the monitor and from everything, but Garageband continues to record and the recording is not affected. This is a huge problem especially if im using a metronome or layering tracks. This does not affect iTunes or anything, JUST GarageBand
please help! should i bring it into a MacGenius?

Hi ladyshade666-
Does it make this noise if you run the Mac with only the mouse, keyboard and monitor attached?
Are you absolutely sure the sound is coming from within the Mac? I have had a couple of FireWire disks that when connected inject all kinds of noise into my amplified speakers. I turn the drives off when I am in the studio.
Reverse polarity is very dangerous and will cause early demise of power supplies. You may also get yourself electrocuted. It may very well be the noise-causing difference in tour scenario.
I think your first call should be to an electrician.
Luck-
-DaddyPaycheck

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When recording, strange noises and audio cut offs

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