Helga,
I have seen similar issues with the log-in screen. Which audio interface 
are you using, the built-in speaker / headphone or an external one? If this 
problem ever occurs again you may want to try changing the audio output. 
Alternatively, you can try to quit VO by pressing CMD+F5, wait for 10 
seconds and then pressing the same key combination again.
I suspect you have a timing issue somewhere in the audio path around 
CoreAudio.
Hope this is of any help
/Roland

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