I have a new clone UNO R3.
If you decide to keep the board, reprogramming the ATMEGA16U2 may bring it to life.
avrdude -c usbtiny -v -p m328p
Please enter a valid email to subscribe
We need to confirm your email address.
To complete the subscription, please click the link in the
email we just sent you.
Thank you for subscribing!
via Egeo 16