Thank you very much for this interesting point because I have to power by usb my widi jack to power it up.
So I have to check the connections more carefully…
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that’s a really good point - it should power from the midi cables
Thank you @Rom and @andybassdoyle, the jack plugged in my dwarf midi output was not correctly inserted. It works fine now. Problem and mystery solved 
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You’re welcome
Nice to know that the problem is solved !!!
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