You only have 2 boards even showing up. Looks like the controller isn't even plugged in. Even with a bad board, it should still show up with all xxxxxxxxxxxx . Check the controller plug on the missing board.
Lemme know more...
Scrap'
It was showing 3 boards mate, rebooting via logging in done nothing and still showed 3 boards, it ONLY went to 2 boards when i physically unplugged it ?
I have checked the ribbon cables between controller and board and is fine.
Also my other faulty miners only show 2 boards, they are the new type self adjusting fan speedd/frequency as well...So it is the norm for me.
I have also swapped pcie-e connections from good board and even new psu's.
NOT worth sending back as they are 11.5Th models and run at 9.6Th !!!
Just hate losing hash power when i have access to free leccy !
Cheers Mate