[Elecraft] KPA 500 Troubles

[dave ingebright]

Well, it happened after an accidental shot of 100 Watt power. KPA had an overpower fault which I cleared. Now I cannot seem to key it. All voltages appear normal, Passthrough OK, I can receive signals. The Fan works, the remote client works. My exciter is sending a ground as verified with a meter. Cable is good. I am shorting the Keyline, and nothing happens; the cable is good. Does anyone have any ideas?
Thanks
Dave
WB7ELY