You're welcome.
mjbentoc wrote: ... what I don't understand is how a installation of a new OS damages the camera...
I don't think it does. You seems more likely to me to be experiencing a conflict related to interaction(s) with one or more third-party software items you have installed.
Some such conflicts can be impossible for us users to find. You do not specifically mention having also tried other web-offered Mavericks/Yosemite suggestions such as attempting to terminate the "VDCAssistant" process or uninstalling AirParrot or AirPlay display mirroring software. However, having tried all the other things already suggested here, I expect you are an experienced user who has diligently tried all reasonably possible remedies. You may even have securely erased your startup disk, reinstalled the latest Mac OS, added and updated necessary third-party software one-item-at-a-time from their original media sources, and thoroughly tested your camera with each individual addition before adding subsequent third-party items.
If you have not tried everything that might offer a solution, or if your problem remains after you have already performed the clean install of all software described above, it may be easier and quicker for you to simply backup your Mac and "... contact Apple or an Apple-Authorized Service Provider for service." per the final "Troubleshooting" suggestion.
Apple approved technicians have access to necessary technical data, parts, special tools, and test equipment to most efficiently troubleshoot and correct even esoteric problems.
Message was edited by: EZ Jim
Mac OSX 10.10.3
