Facetime will not open, just hangs & requires force quit.

Question

I am unable to get Facetime to open at all on my Macbook Pro. The icon for Facetime bounces when clicked, but the program never opens, it just hangs.  I have confirmed the time setting is correctly configured, the messaging application does in fact work properly, I have logged out and back in from the message app, I have restarted the machine, I have ensured I have all of the latest software updates.  Facetime does in fact work both from my Iphone and Ipad, so I know the location isn't the issue.  I thought the problem was a glitch in the previous version of OSX and when Yosemite came out my hope was that it would patch whatever the problem is, but alas, that has not been the case.  I have even tried paying and downloading Facetime from the App store, but it gives me a message that the installed version is newer and does not allow me to download.  Would appreciate any insight into what may be causing this issue and how I may resolve it.  BTW, Skype video chat works fine.  Thanks.

Answer 1

Back up all data.
Quit FaceTime if it’s running. Force quit if necessary. After each of the following steps, log out or restart the computer, then test FaceTime. If the problem isn't resolved, quit again and go on to the next step.
Step 1
Make sure you know the ID and password you use with FaceTime. Launch the Keychain Access application in any of the following ways:
☞ Enter the first few letters of its name into a Spotlight search. Select it in the results (it should be at the top.)
☞ In the Finder, select Go ▹ Utilities from the menu bar, or press the key combination shift-command-U. The application is in the folder that opens.
☞ Open LaunchPad. Click Utilities, then Keychain Access in the icon grid.
Use the search box in the toolbar of the Keychain Access window to find and delete all items with "facetime" or "com.apple.idms" in the name.
Step 2
Hold down the option key and select
          Go ▹ Library
from the Finder menu bar. Move the following items from the Library folder to the Trash (some may not exist):
          Containers/com.apple.FaceTime
          Containers/com.apple.soagent
          IdentityServices
Leave the Library folder open.
Step 3
In the Preferences subfolder, there may be several files having names that begin with one of the following strings:
          com.apple.facetime.bag.plist
          com.apple.FaceTime.plist
          com.apple.ids
          com.apple.imagent
          com.apple.imservice.FaceTime
          com.apple.imservice.ids.FaceTime
Move them all to the Trash.
Also in the Preferences folder, there is a subfolder named "ByHost". Open it and do the same thing.