Dead display on JMP 1 ??

[Wayniac]

Weird - just got a JMP1, and the first time I used it, the display sort of "skipped" like it was cutting out. Third time I plug it in.. NO display (no LED readout, none of the buttons light up, etc) but the sound works!??!
I can also make adjustments (OD1, OD, change bass & treble levels, etc)...
Anyone ever have this problem?
Thanks

PS - SOUNDS great !