The inbuilt iSight video camera wasn’t working in Skype or PhotoBooth. In both cases it was giving an “No video camera detected” error message.
Rummaging around turned up this note that confirms the console view that there’s a missing QuickTime file. This is how to fix it:
Close the relevant apps, then running the following (from a Terminal window) entering your account password if required:
cd /System/Library/QuickTime/QuickTimeUSBVDCDigitizer.component/Contents/MacOS sudo chmod 755 QuickTimeUSBVDCDigitizer
And relaunch the programs using the camera.


Welcome to my blog site -- here to help me work out what I think. Feel free to join in, and start a debate. Cheers -- Jonathan.