[Kenshi]

When I went into garageband I notice it was picking up sound from the mic. How do I turn this off? I am also assuming the camera is on and I want that off too.

[seanc]

Go into System Preferences, Sound then the Input tab.
Either turn the Internal Microphone input volume all the way down or select line in instead.

The camera isn't on unless the green light next to it is.

[Kenshi]

ok thanks

[Cold Warrior]

This is normal for applications that use the mic. Otherwise it's not like your system keeps it on and active all the time.