At 1:29 PM -0400 5/7/2012, [email protected] wrote:
Thanks Dan, wish I'd known about the voltmeter test
Always a good idea to have an xtra PRAM battery laying around. As
Bruce mentioned in his reply, they're standard 1/2 AA 3.6v lithiums.
Google lists quite a few sources.
Don't you agree that your own ideas are getting tired of paying
through the nose so that we can just follow orders of some expert
who doesn't do things like he tells you to do them before you decide
to try his expertise once your own testing at his instruction does
fail...??
huh?
For example, EVERY instruction page, online or in print, says not to
open the box until you've pulled the plug out of the wall and made
certain that the power is off... Don't you agree? So why was it that
the high-priced tech that I trusted to get me my answer once the
power supply idea turned sour, was telling me over the phone later
that he was seeing those legendary clicks as sparking on the
motherboard as he was working on the G4
The average consumer should never ever hack around inside a computer
while it is plugged in. That's a trip to the emergency room that
should never be necessary.
People that do so either have dominant stupidity genes or (hopefully)
know what they're doing and where NOT to put their fat fingers.
Murphy weeds the former out quite well, I expect. Nothing like
waking up on the floor, or not waking up at all, to teach that lesson.
Ditto for people that don't bother to ground themselves before
sticking their fingers in their computer. Static really does damage
things, especially memory and processors.
I'd assume that the PMU is the cuda button, which we did try, a
couple of times, before and after the new power supply unit
(guaranteed to be functional) was installed.
The PMU (Power Management Unit) is a specialized processor that runs
the motherboard. The CUDA button is the PMU's boot trigger. Press
it *ONLY* ONCE after making major changes to the motherboard (like
installing the power supply). If you press it more than once, you
risk it crashing or improperly booting, then draining off the PRAM
Battery.
what's the difference between the interior cuda and that button on
the outside of the G4 that's right alongside and below the power-on
button...
The CUDA resets the PMU.
The external reset button forces a hard reset on the main processor
(CPU) - which causes the Mac to reboot.
As for the motherboard, I'd wonder just what ideas you have on where
to go to get such a vitally needed item which is trustworthily
decently refurbished, assuming that's better than just used but
functional, or is that the case? Use but functional is better?
Given the age of the beast... I wouldn't bother buying a "refirb".
Too expensive. Better to buy something off of LEM Swap, parts or a
whole machine to cannibalize.
Yeah all the peripherals were pulled just so we could get the
machine someplace safe and static-free and that made a better
working place... what sort of internal peripherals would there be
in a G4, maybe an internal modem?
In an iMac - the internal HD and DVD and the airport card. The point
there is that a farked peripheral can cause the IDE or SCSI or SATA
bus to hang, which can cause the machine to not boot, not complete
the self-test (the BONG), etc. When debugging a complex system, it's
better to simplify, to eliminate variables.
- Dan.
--
- Psychoceramic Emeritus; South Jersey, USA, Earth.
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