If your digital video camera is turned off when you open Photo Booth, you see a blank image in the live video area.
If you turn off the camera while Photo Booth is open, the image freezes. You can still take a picture of this image.
If you are using a digital video camera, make sure it’s connected to your computer correctly.
Make sure your digital video camera is turned on. For information turning on your camera, see the instructions that came with it.
To turn on an external iSight camera, turn the front edge of the camera clockwise. A green light indicates that the camera is on.