One day I've put my computer in the Factory reset, just like I did for a thousand times. Except now my taskbar says "No Audio Output Device is Installed".
Well, I googled and did the basic troubleshooting. Built-in audio troubleshooter did not find anything wrong. I turned on IObit Driver Booser for controlling the drivers - all up-to-date. Looked into Device manager and tried updating here, all up-to-date. I have uninstalled them and... there are no drivers anymore, seems its not a problem because my PC sees not one thing connected to it.
I have installed HP PC Hardware diagnostics windows so I can try Audio Playback test according to Step 4 of previously listed support. Could not run it, because there is no device installed. With the Factory reset, my whole computer literally forgots it has built-in speaker. Headphones does not help, PC does not even react to its plugging in. I am sort of lost and due to Covid crisis (and the Czech Republic leading worlds infection statistics) we are quarantined so I can't work or do basicly anything, can't see the technician for repair etc.
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