I'm sorry, didn't know what the best option is. First, to answer your questions:
1. It's an UNO. Actually, I tried two Arduino's. An original and a clone. With both no HV.
2. Not really.
3. I'm plugging the power into the board.
4. There's no noice.
I'm afraid these are not the answers you were looking for?
It's just that I'm not capable myself to troubleshoot because I know little to nothing about electronics. But, I am curious and if it's possible for me to test some of the components I would be glad to do so. I own two things: a soldering iron and a multimeter don't know if that's enough.