[Elecraft] K3 won't power up

[George Thornton]

I have a k3 that was working fine but now will  not power up.

I had lent the unit to someone to use at Field Day.  They reported it would not power up.

Going through the unit it appears  that a nut and washer has come off of one of the PL259 antenna plates.  A thorough internal inspection found a loose washer but no nut.  

There is nothing evidently wrong inside, no flashing, no sparking, no burning odor.  It just won't come on.

Fuse did not activate.

I am going to call the factory tomorrow but anyone have any ideas?