What's causing the humming sound?

Hi.
Iam using Quad with iSight in one city. My daughter is in another city and is using iMac G5 with attached iSight camera. I hear a disturbing hum or buzzing sound when she speaks. When I speak the hum seems to stop temporarily. I don't think the problem is at my endbut perhaps it is. We've tried repositioning the camera but that had no effect. Any suggestions as to what may be the cause of the hum?
Thanks.
G4 and Mac Mini Mac OS X (10.3.9)

Hi,
Do what Defcom says at your daughter's end.
It may the position of the Camera/mic compared to External Speakers and may need them turning down a bit.
If she has them turned up becuase you are too quite then you will have to put the sound up in the place Defcom says. Ideally the bars should get to between 1/2 and 3/4
7:47 PM Friday; April 28, 2006

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What's causing the humming sound?

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