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Dead MDD? [message #330263] Mon, 22 August 2016 13:41 Go to next message
Jörg Duurkoop is currently offline  Jörg Duurkoop
Messages: 47
Registered: November 2012
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Member
Hi,

I just returned from a 5-week vacation and my MDD won't start anymore. No
sound no light, nothing.

I left it plugged in as I found that it helps prolonging the life of the
PRAM battery.

Any ideas what it could be? The Mac worked perfectly when I left for my
holidays. I'm flummoxed, I love that machine.

Thank you for any comments.

Jörg.

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Re: Dead MDD? [message #330265 is a reply to message #330263] Mon, 22 August 2016 14:09 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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Unplug it, press the CUDA switch a couple times, then plug it back in.

I’ve had issues like this with computers subject to power line issues like brownouts and such…basically the startup circuitry gets confused and the computer won’t start.

With a MDD this could also be the flaky power supply as well. Every MDD we ever had eventually needed a PS replacement, and this was the symptom.



> On Aug 22, 2016, at 10:41 AM, Jörg Duurkoop <yawgie@gmail.com> wrote:
>
> Hi,
>
> I just returned from a 5-week vacation and my MDD won't start anymore. No sound no light, nothing.
>
> I left it plugged in as I found that it helps prolonging the life of the PRAM battery.
>
> Any ideas what it could be? The Mac worked perfectly when I left for my holidays. I'm flummoxed, I love that machine.
>
> Thank you for any comments.
>
> Jörg.
>
> --
> --
> You received this message because you are a member of G-Group, a group for those using G3, G4, and G5 desktop Macs - with a particular focus on Power Macs.
> The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
> To post to this group, send email to g3-5-list@googlegroups.com
> For more options, visit this group at http://groups.google.com/group/g3-5-list
>
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--
Bruce Johnson
University of Arizona
College of Pharmacy
Information Technology Group

Institutions do not have opinions, merely customs

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Re: Dead MDD? [message #330267 is a reply to message #330263] Mon, 22 August 2016 14:17 Go to previous messageGo to next message
Kenneth Peterson is currently offline  Kenneth Peterson
Messages: 2
Registered: August 2015
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Junior Member
> I just returned from a 5-week vacation and my MDD won't start
> anymore. No sound no light, nothing.
>
> I left it plugged in as I found that it helps prolonging the life of
> the PRAM battery.
>
> Any ideas what it could be? The Mac worked perfectly when I left for
> my holidays. I'm flummoxed, I love that machine.

My MDD has gone through 4 power supplies in 10 years. That'd be my
first assumption given your symptoms.

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Re: Dead MDD? [message #330271 is a reply to message #330263] Wed, 24 August 2016 17:12 Go to previous messageGo to next message
Jörg Duurkoop is currently offline  Jörg Duurkoop
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Registered: November 2012
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I transplanted all disks and drives from my "dead" dual 1.25 GHz MDD to
another 1 GHz single-CPU MDD (FireWire 400) and have everything working
again. But ...

I have also the optional developer toolkit installed and the Hardware
control panel still shows two processors running at 1 GHz. So does the
Apple System Profile. Activity Monitor also shows two CPUs. When I switch
off one CPU via the Hardware control panel, Apple sys. prof. shows only one
CPU. So Hardware created a virtual CPU and Sys. Prof. gets its info from
Hardware??

Sys. Prof. sees the mobo running at 167 MHz. So maybe the CPU's real speed
would be 1.25 GHz? I think this MDD was made in 2003, the last FW 400
edition for people who still needed to boot into Sys. 9.

Anyway, I will replace the CPU and install my dual CPU-card again after
getting some Arctic Silver.

Thanks again for all comments,

Jörg.

Op maandag 22 augustus 2016 19:41:37 UTC+2 schreef Jörg Duurkoop:
>
> Hi,
>
> I just returned from a 5-week vacation and my MDD won't start anymore. No
> sound no light, nothing.
>
> I left it plugged in as I found that it helps prolonging the life of the
> PRAM battery.
>
> Any ideas what it could be? The Mac worked perfectly when I left for my
> holidays. I'm flummoxed, I love that machine.
>
> Thank you again for all comments.
>
> Jörg.
>

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The list FAQ is at http://lowendmac.com/lists/g-list.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml
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Re: Dead MDD? [message #330285 is a reply to message #330265] Fri, 26 August 2016 14:26 Go to previous message
JoeTaxpayer is currently offline  JoeTaxpayer
Messages: 16
Registered: August 2012
Karma: 0
Junior Member


On Monday, August 22, 2016 at 2:09:54 PM UTC-4, joh...@pharmacy.arizona.edu
wrote:
>
> Unplug it, press the CUDA switch a couple times, then plug it back in.
>
> I’ve had issues like this with computers subject to power line issues like
> brownouts and such…basically the startup circuitry gets confused and the
> computer won’t start.
>
> With a MDD this could also be the flaky power supply as well. Every MDD we
> ever had eventually needed a PS replacement, and this was the symptom.
>
>
>
After my last MDD (of 5 I owned) power supply died, I found a G5 to run PPC
apps that required Leopard. Not to mention some peripherals that I still
wanted to use. I loved my MDDs, but the time and cost to replace the
supply was more than just buying the G5 which seems to not have this issue.


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