Read the statement by Michael Teeuw here.
MM not loading after software update
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 @Redicaljk MagicMirror does not update that way, only system stuff. but maybe node/npm changed 
 .can u show results ofnode -v 
 npm -v
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 @sdetweil sorry, I am a complete newbie. I tried entering node-v and npm-v in the terminal and I get “command not found”. 
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 @Redicaljk there is a space between node and -v 
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 @sdetweil thank you! 
 pi@rpi4:~ $ node -v
 v16.17.0
 pi@rpi4:~ $ npm -v
 8.15.0
 pi@rpi4:~ $
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 @Redicaljk ok, lets redo the npm install for MagicMirror cd ~/MagicMirror rm -rf node_modules rm package-lock.json npm install --omit=dev
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 @sdetweil done. Still having an issue: magicmirror@2.20.0 start 
 DISPLAY=“${DISPLAY:=:0}” ./node_modules/.bin/electron js/electron.js[20.08.2022 09:12.14.860] [LOG] Starting MagicMirror: v2.20.0 
 [20.08.2022 09:12.14.865] [LOG] Loading config …
 [20.08.2022 09:12.14.871] [LOG] Loading module helpers …
 [20.08.2022 09:12.14.873] [LOG] No helper found for module: alert.
 [20.08.2022 09:12.15.181] [LOG] Initializing new module helper …
 [20.08.2022 09:12.15.182] [LOG] Module helper loaded: MMM-AlexaControl
 [20.08.2022 09:12.15.185] [LOG] Initializing new module helper …
 [20.08.2022 09:12.15.186] [LOG] Module helper loaded: updatenotification
 [20.08.2022 09:12.15.186] [LOG] No helper found for module: clock.
 [20.08.2022 09:12.15.403] [LOG] Initializing new module helper …
 [20.08.2022 09:12.15.404] [LOG] Module helper loaded: calendar
 [20.08.2022 09:12.15.404] [LOG] No helper found for module: calendar_monthly.
 [20.08.2022 09:12.15.405] [LOG] No helper found for module: weather.
 [20.08.2022 09:12.15.408] [ERROR] WARNING! Could not load config file. Starting with default configuration. Error found: Error: Cannot find module ‘jsdom’
 Require stack:- /home/pi/MagicMirror/modules/MMM-OnThisDay/node_helper.js
- /home/pi/MagicMirror/js/app.js
- /home/pi/MagicMirror/js/electron.js
- /home/pi/MagicMirror/node_modules/electron/dist/resources/default_app.asar/main.js
 
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 @Redicaljk see this topic, for missing libraries https://forum.magicmirror.builders/topic/15778/fix-for-black-screen-in-2-16-and-later, 1st post gives instructions 
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 @sdetweil thank you! I’ll give it a try. 
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 @Redicaljk Looks like the original issue has been resolved, however, MM still crashes. I can’t copy the error without this post being marked as spam!!! 
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 @Redicaljk send to me in email… 
 same userid at gmail
