[Elecraft] New KX3 can no longer be powered on

[Mark, KE6BB via Elecraft]

It sounds like the radio is not getting any power. I would suspect the power supply and cables before suspecting a problem with the radio.  Have the easy things been eliminated as the problem?   Is the power supply good?  Has a fuse in the power supply been blown?  Is there voltage at the radio end of the power cable?

The problem is often with the coaxial power connector.  If the operator isn't using the cable supplied by Elecraft, it may not make reliable connection with the radio.  There are a lot of connectors on the market that are close to 2.1mm, but really don't work.  I found one that had all the right diameters, but was simply too short.

There was also a problem with early KX3's with the connectors pulling away from the PC board, but if his radio is new, that shouldn't be the problem. 

Mark, KE6BB