[Elecraft] KAT-500 Not Attempting to Tune

[Byron Peebles]

When I powered on the station tonight, I noticed nothing unusual, except 
I had no power out.

My KAT-500 makes no attempt to tune when I use the K3S tune button.

I've checked all cables, updated KAT firmware, restored configuration, 
no change.

When I first received this in 2015, a power-cycle solved this, but not 
this time.
SWR fluctuates 11-20 on the K3S display.

Any ideas?  All other functions seem to work, except this rather 
important one.

CQWW SSB this weekend.  I need this working.

73, Byron