[James]

Honestly, I did give this a lot of thought, and if it is NOT the fuses, then
it will be difficult for you to figure it out I think. But now that you
mention an external amp, ( and I don't have much experience at this), but
as I recall, when you use an external amp, I think that the switching of
that amp to "on" is what triggers the head unit to come on.......... so, my
next step after re-checking the primary fuses again would be to **pull**
that amp and look closely for a fuse there on the amp. It could be in a
spot that you cannot see just by removing the access panel. If you have a
bad amp fuse, I honestly believe that would prevent your radio from coming
on.............

By the way, where is MOSFET when we need him ????? Come on and chime in
!!

Check it out !!!

James