Hi @Ezenia, and welcome to the community.
Thank you for your detailed description of the problem and for ruling out some possible sources of error, especially with the hardware.
In my opinion, the problem should be solved by resetting the PC to the factory settings, because as you have already described, the problem is probably caused by a faulty Windows update:
Tips: How to restore the system of Windows devices - MEDION Community
If the problem persists, please let us know.
Regards, EastClintwood
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