David Kenning wrote: ... Any idea what I can try next?
As I understand your writings here, you have already unsuccessfully tried everything that has already been suggested to this point. If that is correct, here are four more suggestions you can try in any order you choose:
(1) Restart Mac. Repair permissions.
Then download and reinstall OS X 10.4.11 Combo Update.
Repair permissions again immediately after the restart that completes the Combo Update.
Properly applying the latest Combo update version for your OS X can sometimes correct software problems. However, if your trouble is caused by a hardware problem, you will need help from an Apple-Authorized Service Provider.
(2) If your problem remains, reinstall OS X 10.4.11 to see if that corrects it.
If you do not have a backup of your Mac OS from a time when your it was known to be working properly, you can contact Apple or your Apple retailer to get a replacement Install disk. Have your MacBook's Serial Number when you call.
(3) If reinstalling OS X does not correct your problem, backup your MacBook.
Then make an appointment to have your Mac serviced by Apple
or an Apple-Authorized Service Provider.
(4) If possible, find and use a different video chat app that works on your Mac.
If you MUST use Skype, use a different computer.
Message was edited by: EZ Jim
Mac OSX 10.8.3