[Elecraft] KAT500 refuses to turn on

[k2zf50 at aol.com]

Hi All,I have the K line here. I was listening to a QSO and out of the blue my KAT500 lost power.I disconnected everything from the KAT500 and then reconnected. The power plug has 12 volts so that is not the problem.The KAT500 was set up to turn on automatically when I turned on the power supply and now that does not work anymore.When I press the mode button to turn on the tuner that does not work now either. Where do I start looking?Thanks, Jim Douglas  K2ZF