HELP chirping noise while recording

Sep 8, 2011
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I used quicktime screen recording for the first time tonight and it worked great the first time but now when i turn the volume up on it there is this chirping/shrill beeping sound that gradually gets louder. i need help figuring out what is wrong! at first i thought it was because something such as an electronic was too close or whatever but i took my ipod and phone away but it still happened. there is nothing else that i think would cause the computer to make that sound. i have a macbook pro.

please give me advice and help me. thanks.

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