[Elecraft] K3 Power problem: won't shut down and blank screen on power on

[Hunsdon Cary III]

Elecrafters:  Tech support at Elecraft is closed at the moment.  I had a nice QSO with W0YY a few minutes ago and when I went to shut down the K3, the "Power" button did not work.  Tried pushing it from a variety of angles, no dice. I powered down by turning my Astron RS-35M off - that did the trick!  After supper, I sat down for some 40 meter fun and, lo and behold, the power button worked BUT the display is BLANK…no K4TM welcoming message….TOTALLY BLANK!
Any ideas before Elecraft tech support comes on line for me about noon tomorrow?
Tnx & 73,
Cary, K4TM
Lynchburg VA
Elecraft K3-100 #3448, KAT500 #144, KPA500 #698
h3cary at gmail.com