I have just upgraded to the latest version of OSX as invited by Apple. Since then iTunes will not play and my volume controls have stopped working - in Preferences the sound controller is not able to find any input or output devices. What is going on?

I have just upgraded to the latest version of OSX as invited by Apple. Since then iTunes will not play and my volume controls have stopped working - in Preferences the sound controller is not able to find any input or output devices. What is going on?

Please read this whole message before doing anything.
This procedure is a diagnostic test. It’s unlikely to solve your problem. Don’t be disappointed when you find that nothing has changed after you complete it.
The purpose of the test is to determine whether the problem is caused by third-party software that loads automatically at startup or login, or by a peripheral device. 
Disconnect all wired peripherals except those needed for the test, and remove all aftermarket expansion cards. Boot in safe mode* and log in to the account with the problem. The instructions provided by Apple are as follows:
Shut down your computer, wait 30 seconds, and then hold down the shift key while pressing the power button.
When you see the gray Apple logo, release the shift key.
If you are prompted to log in, type your password, and then hold down the shift key again as you click  Log in.
*Note: If FileVault is enabled under OS X 10.7 or later, or if a firmware password is set, or if the boot volume is a software RAID, you can’t boot in safe mode. Safe mode is much slower to boot and run than normal, and some things won’t work at all, including wireless networking on certain Macs. The next normal boot may also be somewhat slow.
The login screen appears even if you usually log in automatically. You must know your login password in order to log in. If you’ve forgotten the password, you will need to reset it before you begin. 
There will be no audio output in safe mode. The question to be answered by the test is whether any devices are listed in the Sound preference pane. After testing, reboot as usual (i.e., not in safe mode) and verify that you still have the problem. Post the results of the test.

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