iSight "Your camera is in use by another application" message

The message, "Your camera is in use by another application" may appear when you try to video conference.

If this happens, follow these steps:

1. Quit all applications that are using iSight. If you don't know which applications might be using iSight, quit all open applications. Examples of some (but not all) applications which can use the iSight camera include iChat, iMovie 6, Comic Life, and PhotoBooth.
   
   Note: If you're using Mac OS X 10.4.8 and Classic, see this article.
    
2. Open only one application and use iSight.
3. If the issue persists and you are using an external iSight, unplug the FireWire cable from your computer and the camera, wait a few seconds, and then firmly (without forcing) plug the cable back in to the camera and the computer.

Important: FireWire ports are keyed so the FireWire cable can only be inserted one way. Ensure you are inserting the FireWire cable into the FireWire port in the correct orientation.