Does it show up in device manager when you plug it in? You should see USB Display Adapter in the 'USB Controllers' section. Alternatively switch to 'by connection' view and you should see it off the controller it's attached to.
First step is: it should appear with the correct device ID (VID 17e9, PID whatever). If that doesn't happen nothing is going to help, and it's a HW thing requiring a replacement.
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