I have a MacBook with built in webcam, external webcam, and iChat. Next to everyone who has a Mac on iChat is the green box, but there is a phone icon rather than a video icon. Video chats used to work, but suddenly they stopped. Clicking the green icon next to my name on top opens a box that days "My Build-in iSight" and I can see myself in that webcam, but can not make video chats. How can I fix this?