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there's often an FN and screen toggle button combo on laptops to turn screen sharing on or off. have a look along the top row of function keys maybe an update turned it back to off by default or something.
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HDMI?
It can be finicky about when it's plugged in. Try turning it off and waiting until boot before plugging in. Try again with it plugged in before turning on. Things like that.
If you are in Windows, go into display settings and poke around to see if it can detect it. Then unplug and try again.
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How is it connected? Dongles are notoriously finickity.
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Are there any other video outputs you could use, e.g USB/DisplayPort/VGA?
You could also try rolling back the update.
It's also possible the port has failed.
HatBeard
hippy
aggi
chez_jay
@Light_EDDed
My good lady has tried to add an additional screen to her laptop. But since a recent update was completed it won’t detect the secondary screen. Any ideas why and what to do about it would be appreciated