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After reinstall of W10, no USB-C monitors

We have a few Dell Latitude 5480. All using USB-C monitors such as Dell 2718D.

They all worked fine for a year. I reinstalled W10 on one of them using the recovery tool (because new user). Then windows update and the command tool (thru command it also got a BIOS/firmware update). All worked fine except for one thing: This computer and this one only no longer works with USB-C monitors. Before the reinstall everything worked fine, after the reinstall no USB-C monitors work.


When attaching a monitor it says something (translated inte english): 'The monitorconnection can be a monitor. Please check if your computer supports the Displayport unit you are connecting to.'


I'm not sure what to do or where the problem originates. Any ideas?


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