HOW TO FIX DISABLED AUDIO SOUND ON OS X 10.10 YOSEMITE.
As we know recently Apple formally released OS X Yosemite, its newest operating system for Mac computers. For most Mac users, the operating system has been much anticipated since it was first unveiled at the company’s annual developers conference in June 2014. The Yosemite OS is free, and is downloadable through the Mac App Store.
Apple says that Mac computers from as far back mid 2007 will support OS X Yosemite, but as we have seen with any other new software releases, sometimes updating your old Mac to a newer software usually does not work out perfectly. One of the problem I encountered after upgrading my Macbook Pro to OS X Yosemite is that the volume icon at the top righthand task bar is greyed out and the audio sound does not work. Well if you ever encountered such similar problem, don't worry! Just follow the following steps carefully and it will fix the audio sound problem on your Mac without any hassle.