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----------- erratic g4 mdd powering on and sleep problems [message #32594] Thu, 10 January 2013 14:14 Go to next message
rumble is currently offline  rumble
Messages: 2
Registered: January 2013
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Junior Member
i have an old mdd running tiger, and every once in a while if i put it to
sleep overnight, then come back, it has actually powered itself back on,
and sometimes i find that it has shut itself off when i come back in the
morning.

when it does this i have a hard time getting it to power back on again and
i usually have to disconnect the ac power, then press and hold the power on
button for a second, then plug the ac cord back in and it would power on
again when i pressed the button.

yesterday i couldn't get it to power back on and i unplugged the ac and hit
the pmu button for a few seconds then plugged everything back in
and it came on again.

last night i actually powered it down, and today it will no power back on
no matter what i try.

when i push the power button on it briefly lights up then goes out. if i do
it a few times in a row the light will stop coming on, unless i leave it
alone for several seconds.


is my power supply dead or is there some other problem?


thanks

rb

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Re: ----------- erratic g4 mdd powering on and sleep problems [message #32595 is a reply to message #32594] Thu, 10 January 2013 15:36 Go to previous messageGo to next message
Bruce Johnson is currently offline  Bruce Johnson
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Registered: August 2012
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On Jan 10, 2013, at 12:14 PM, rumble <rumble@metrocast.net> wrote:

> i have an old mdd running tiger, and every once in a while if i put it to sleep overnight, then come back, it has actually powered itself back on, and sometimes i find that it has shut itself off when i come back in the morning.


Nearly dead PRAM batteries can cause all sorts of issues with G4 towers; I'd look there first, particularly if it's intermittent.

However the failure mode you're describing is very similar to failing power supplies in Quicksilver models; I believe the PS in the MDD is different, but if swapping in a new PRAM battery doesn't fix it, I'd look to replacing the PS.

--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs


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Re: ----------- erratic g4 mdd powering on and sleep problems [message #32597 is a reply to message #32595] Thu, 10 January 2013 15:46 Go to previous messageGo to next message
Mac User #330250 is currently offline  Mac User #330250
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---------- Original message ----------
Subject: Re: ----------- erratic g4 mdd powering on and sleep problems
Date: Thursday, 10. January 2013
From: Bruce Johnson <johnson@pharmacy.arizona.edu>
To: g3-5-list@googlegroups.com
> Nearly dead PRAM batteries can cause all sorts of issues with G4 towers;

> I'd look there first, particularly if it's intermittent.


I’ve worked with a couple of Power Macs G3 B&W up to G5’s, and also with a
Power Mac G4 MDD.

It *always* worked without a PRAM battery.
It sometimes *did not* work with an old PRAM battery that needed replacement.

So: I would see what it does without a PRAM battery. Remove it. Disconnect the
AC. Wait a few minutes. Power it on, holding Cmd-Opt-P-R. See what it does.

> However the failure mode you're describing is very similar to failing power

> supplies in Quicksilver models; I believe the PS in the MDD is different,

> but if swapping in a new PRAM battery doesn't fix it, I'd look to

> replacing the PS.


Also a good guess.


Cheers,
Andreas aka Mac User #330250

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Re: ----------- erratic g4 mdd powering on and sleep problems [message #32671 is a reply to message #32594] Fri, 11 January 2013 01:28 Go to previous messageGo to next message
Jörg Duurkoop is currently offline  Jörg Duurkoop
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Hi rumble,

Op vrijdag 11 januari 2013 02:14:39 UTC+7 schreef rumble het volgende:
>

>

> is my power supply dead or is there some other problem?

>

> I had the same problems like you on my 1.25 MDD. Replacing the battery,

mainboard and PSU didn't help in my case, it appeared to be a bad CPU.

I got a cheap dual 1.25 and everything is better than ever before thanks to
the increased speed of the dual CPU. When the MDD made too much noise in
the summer - the dual running hotter than the single - I got the special
developer's SW with which you can switch of one of the CPUs with software.
Works well.

Anyway I wish I was wrong in your case but there it is, my two cents ...

Best of luck, Jörg.

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Re: ----------- erratic g4 mdd powering on and sleep problems [message #32808 is a reply to message #32595] Fri, 11 January 2013 15:28 Go to previous messageGo to next message
rumble is currently offline  rumble
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Registered: January 2013
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Junior Member
thanks
i swapped the battery with one from another mac and got it running again
but it took several tries of the power button.
i'm in the process of moving all my data and retiring the machine.


On Thursday, January 10, 2013 3:36:10 PM UTC-5, joh...@pharmacy.arizona.edu
wrote:
>

>

> On Jan 10, 2013, at 12:14 PM, rumble <rum...@metrocast.net <javascript:>>

> wrote:

>

>> i have an old mdd running tiger, and every once in a while if i put it

> to sleep overnight, then come back, it has actually powered itself back on,

> and sometimes i find that it has shut itself off when i come back in the

> morning.

>

> Nearly dead PRAM batteries can cause all sorts of issues with G4 towers;

> I'd look there first, particularly if it's intermittent.

>

> However the failure mode you're describing is very similar to failing

> power supplies in Quicksilver models; I believe the PS in the MDD is

> different, but if swapping in a new PRAM battery doesn't fix it, I'd look

> to replacing the PS.

>

> --

> Bruce Johnson

> University of Arizona

> College of Pharmacy

> Information Technology Group

>

> Institutions do not have opinions, merely customs

>

>

>


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Re: ----------- erratic g4 mdd powering on and sleep problems [message #32859 is a reply to message #32808] Fri, 11 January 2013 18:49 Go to previous message
Kris Tilford is currently offline  Kris Tilford
Messages: 133
Registered: August 2012
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Senior Member
On Jan 11, 2013, at 2:28 PM, rumble wrote:

> but it took several tries of the power button.


Sounds like a flakey power button.
Likely a mechanical issue rather than an electrical issue.

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