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 please?
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?