No sound?
I am using Musescore 3.0 on my laptop, and I suddenly can't play any sound in the program.This have not been any issue before. I tried uninstalling and re-installing, but the problem remains. Does anybody else have this problem? 
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Uninstalling and re-installing almost never fixes things, reverting to factory settings much more likely does
"Suddenly" is also not something MuseScore generally does by itself. There's a chance you've had some updated, or connected a (bluetooth) headset in a way such that MuseScore is unable to auto-detect the change and/or the device.
Have a look at Preferences → IO to see if your audio driver/device is still selected; if the dropdowns are empty, there's a button to force MuseScore to rescan the possible audio devices.
Also check the Synthesizer to see if you actually have a soundfont loaded into MuseScore (by default, in the Fluid tab you should see MuseScore_General.sf3)
In reply to "Suddenly" is also not… by jeetee
Clicked on anything that seemed logical in Preferences, and everything suddenly worked again.
Still no clue what happened, but thank you :)