What about the hololens driver?
I reinstalled the driver, tried different versions, on one of the 3 pcs I tested I did a fresh windows instalation.
What happens when you plug it in? Literally nothing. Do you hear the connection noise? Any lights/power LEDs? Is anything being displayed?
First thing I'd check would be connecting it to a USB wall adaptor incase your PC/USB port isn't delivering enough power.
I'll collect mine this weekend so can hopefully offer a couple of suggestions to help! Assuming mine actually works
To be fair reading your reply it sounds like you know what you're doing so it probably is faulty unfortunately.