One Board : Can't get to CLI to install new OS

Hi
I have had a Up Board (the original) in storage for a long time. I am trying to connect to the Up and update the OS, but I can't.
I originally setup the Up Board with an IP address etc. I was aiming to use it as a headless Linux box. I may have disabled the video output, if that was an option.
So now I want to use the Up board for a CCTV app. I am trying to install a new Ubuntu OS. I created and plugged in a bootable USB with Ubuntu for installation. I connected to a keyboard and display.
When I boot the Up, there is no video output. When I try and connect via Ethernet, I can't ping the IP address of the Up.
I have looked in the Wiki to see if I can find an answer.
Is there a way I can force the Up to boot to the USB?
Is there a way I can do a factory reset of the Up?
Is there something else I can try?