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[lukas2]

Hello, I have a question, why did my computer start acting up today and everything was fine yesterday  ??

[Falcon_ASUS]

@lukas2 
Could you please let me know the complete model of the laptop you are using? 
How to find Model Name
Based on the provided image, it is possible that there is an issue with the graphics card control program. 
It is recommended that you visit the ASUS website, go to the download section, find your product, and download the relevant drivers.
https://www.asus.com/support/download-center/  
Then go to Settings > Apps > Installed apps, uninstall the Nvidia display control panel, restart the laptop, and reinstall the drivers to check if the issue is resolved.
Sorry for any inconvenience it may be caused. 

[lukas2]

@Falcon_ASUS loptopFA506IC

[Eman41]

Hi, I will suggset trying these troubleshooting steps from the ASUS website:  https://rog.asus.com/support/faq/1051385/. Regarding for external GPU issue.