Yaesu FT-857D won't power up...

[N2JBO]

I was using the rig just a little while ago. I had it powered up
and tried to UNLOCK the head and reposition the mike cable
to the bottom instead of the side of the radio, while powered up.
The radio just shut down. I checked the 2 fuses on the power cord,
okay, the LDG Z-100 tuner and the LDG FT-Meter still work.

I have the radio hooked up to an Astron SS-25 and that is fine.

But the radio will not power up ?

Is there an INTERNAL FUSE ?

Help, thanks in advance,

Dave