Suddenly today my iSight video image has the attached interference pattern flashing on and off. Has anyone seen this before? I have quickly tested the following: 1. Unplugging bluetooth USB dongle. 2. Tested another firewire cable. 3. Swapped firewire socket used. 4. Rebooted. 5. Restarted iChat AV. 6. Turned off cordless phone (not base station) that is next to computer. Thanks for any help.