>   PROBLEM:
>   my dear old PB G4 Titanium (500MHz, no Gbit, no DVI -=20
> the real old one) does not power on any more: whether I=20
> leave the battery in place or not,

Allen, Michael,

  thankyou for your information.

  I was not able to pull "ifixit.com" off google, so I'm
glad I've been pointed to this: I've found and read the=20
related article.

  Albeit I know where the PMU reset button is, I did not=20
know that it does a "sane discharge": I merely expected it=20
to be sort of a 'logic' reset of the PMU and now I better=20
understand -and agree upon- keeping it pressed for a long
time. I'll try harder on this in my spare time.

> >   what voltage at which pins are expected?
> Something between 12v and 16v IIRC, on the two inner rings=20
> of the central pin - the tip is unconnected or ground.

  I love to know this.  :-)

  Is the DC voltage unregulated?=20
  must it be precise within certain limits?

  I hope to be able to perform trials with my lab=20
power supply, therefore also my next question:

  Is the outer "shell" also a ground connection?
(or does it only serve as a protection against shorts when
the DC cable is danging around?)

best whishes
Stephan