Webcam and ports

whenever a device is connected or disconnected to my mac, my webcam drops out! this has happened so far with yahoo im, but I'm sure that it would happen in other apps too. why?

For purposes of helping you, it would be a lot more useful for us to know what actually does happen, rather than what you're "sure" will happen. So do some more testing and report back:
Do only USB connections cause the iSight to turn off? (The iSight is a USB device, so that would make a certain amount of sense.) Or do FireWire, video and audio port connections trigger the problem too?
Does it matter which USB port the additional device is connected to?
Does it happen under AC power as well as under battery power?
Does it happen when you connect a device that has its own AC power supply?
What applications do you have that use the iSight camera? Does the problem occur in all of them?

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