[Elecraft] K2 dead

[W2bpi1 at aol.com]

Before supper was working. Left on and went to supper. Came  back from 
supper and no display but power is on. No sig heard. Turn power switch  off. 
When I turn it back on no display and loud hum in headphones. Then I hear  some 
motor boating and headphones go dead. Check input voltage. SW off 13 VDC,  
SW on 4 VDC. Check cable and it is OK. Try another power supply and cable. 
Same  thing happens.  Now what?  Help   Geo/W2BPI