Protecting mono from upgrade, sound test

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My copy of NOOBS is fully up to date, but because of an issue with the  
usb port use, I had to install an old version V3.x of mono. How can I  
protect that old version of mono from being updated in the future  

I have just bought my first Pi (Pi 3B+), so familiarity is still low. I  
plugged an earphone into the 3.5mm socket, expecting to hear some sort  
of noise or beep from it, but nothing.

Is there a simple way to get the thing to produce some audio noise  
please, just to prove it is working?

sound test
On Wed, 11 Jul 2018 09:48:16 +0100, Harry Bloomfield

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Point the chrome browser and play a video. Most of them have sound.
If sound doesn't work, use raspi-config to change the audio options.
Kees Nuyt

Re: sound test
on 11/07/2018, Kees Nuyt supposed :
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Thanks, I will try that..

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