Problem with built-in Mac Book webcam iSight
The webcam seems to be active (red light is flashing) but it is neither possible to activate nor to deactivate the webcam. That implies that no webcam using application is able to use it, e.g. for a video conference with Skype. By trying to use the webcam via an application the statement "another program may have it in use" is prompted.
I haven't figured out what causes this bug, but it can be solved by resetting the PRAM (parameter random-access memory) of your Mac Book.
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Resetting PRAM (to fix iSight bug)
Before resetting the PRAM check if there could be maybe some other reasons why your iSight is not working properly. To do so you can follow the instructions of this apple support page http://support.apple.com/kb/HT2090 (steps 1-3).
If your iSight is still not working (but red light is flashing) you have to reset your PRAM.
1) You have to shut down your computer.
2) For resetting you will need to press (step 4) the following keys on the keyboard:
Command, Option (german boards: alt), P and R
3) Turn on the computer.
4) Promptly press and hold the the key-combination (Command, Option, P, R). You need to do this before the gray screen appears. Keep holding the keys until the computer restarts again and you hear the start up sound for the second time. This start up sound will be louder than normal.
5) Release the keys and proceed with the log in as usual.
More info can be found here: http://docs.info.apple.com/article.html?path=Mac/10.6/en/26871.html
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