"Ever happen to you" strange electronics

Hello Audiogoners, the other night I had a very strange thing hapeen to me as I reached for my Krell remote to conclude a very enjoyable evening listening to my music my Krell FPB 200, would not shut down and go into standby mode, even manually depressing the silver button on front, it stll refuses to shut down!!*$$##$F@@!!!! what's left little toggle switch on back of amp only used it when amp was in standby, OH, well here goes!!?? amp off and so is circut breaker, no power, power back in house and Amp appears to be ok "KNOCK ON WOOD" Any ideas!!?? Thank you.

Aoltes