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Audio "No Output Devices Found" after running fine for awhile. Restarting fixes, but t

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I have this exact same problem with a HP Z Book touch screen.


I already fixed the problem before (not sure how) but now it is back.   This is an expensive machine - I expect basic sound !!!!


What can I do please ? 

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I originally posted this problem.

Thank you to all who gave suggestions. However, I tried many things to try to solve my problem, and nothing worked. So I lived with it for awhile.

Then, while trying several things,  I eventually found the following, which seems to solve my problem:


Windows> ProgramFiles> Conexant >CNXT_AUDIO_HDA

     > Click on and run: UIU64a.exe

           which is:

                 Conexant Universal Device Install/Uninstall x64 Application


I ran this once, and it fixed my problem.

(The problem once reoccurred when I Restarted, so I ran UIU64a.exe. The problem went away, and it thus far has never returned.)

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