K2: Problem with new build? Buttons and encoder are dead

[N0SA]

I am building a new K2 and have run into a problem.
When I do my initial power on testing I get the Elecraft message then 7.1000 and the realys click. But none
of my front panel buttons nor the encoder work.
What should I look for first?
I have double checked all my solder connections and all the parts are installed up to this point.
Larry N0SA