Dod Fx35 Octoplus, switching off, than not on!?

[tone seeker]

Well I obtained a DoD octoplus, at a flea market,
And, it's giving me trouble. I've checked it, with
A new battery, and power supply.
  At first, when I would plug into the
Input, it would automatically, be in
Effect mode, and work. Than when I go to
Click it off, (bypass). It won't turn back on.
I've tried several switches, (momentary) and
They do the same thing. I checked the circuit for
Dead caps, fiddle with it, and than it switches, off
And on, no problem! So l box it back up, and it's,
Back to it's old tricks!
  I really do not know (nor understand), how the
Switch interacts, with the circuit, turning it off,
and On. Let alone what the true problem is. I
Have wired up 2 different switches, with the
Same problem, so I really don't think thats it.
  Any idea's on where in the circuit I could look.
Or is it maybe bad wiring, to the input, and
Output jacks?