experiencing the exact same problem:
my momo was working fine for the week or so I've had it,
then I shut it off one night, came back in the morning,
and it was totally dead.
I plug in the big connector to the side of the wheel,
and neither led lights up, so I'm assuming theres no power
getting through.
I checked the transformer with a meter, thats ok, so the
problem must be in the wheel itself.
cable-wiggling did not help either.
anyone else had this?