I am very happy with this screen, but since a week my good old Mac keyboard no longer works on any of the three (old) USB ports. Neither at the bottom of the screen, nor at the back in the middle of the screen. I haven't adjusted anything (to my knowledge). Can anyone help me?

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Accepted Answer

What about connecting the keyboard directly to your notebook/PC?

Answer

This does not answer my question. Can anyone give me a tip on how to find out if a USB-A port is still working?

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Question about U2421E - 372988

I am very happy with this screen, but since a week my good old Mac keyboard no longer works on any of the three (old) USB ports. Neither at the bottom of the screen, nor at the back in the middle of the screen. I haven't adjusted anything (to my knowledge). Can anyone help me?