From Newsgroup: comp.sys.mac.system

My Power Macintosh G4 (gigabit model with dual 450MHz CPUs has
started to exhibit strange behaviour. It just shuts down with no warning
as if the power cord has been pulled out. I'm not sure what the problem
could be but I have a feeling it is going to be expensive to fix.

Anyone heard of anything like this? Any advice? I've opened the
case and have a fan blowing across the motherboard and CPUs in case they
are overheating but it doesn't seem to help. Temperature Monitor says my
CPUs are running at 20 degrees celcius which doesn't some high to me.

Any and all help would be appreciated.

--
Bjorn Nitmo <bjorn@deepsky.com>
Yes, my name is Bjorn and no, I don't work at Ikea.

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From Newsgroup: comp.sys.mac.system

On Wed, 02 Jul 2003 21:19:54 GMT, Bjorn Nitmo <bjorn@deepsky.com>
wrote:

My Power Macintosh G4 (gigabit model with dual 450MHz CPUs has
started to exhibit strange behaviour. It just shuts down with no warning
as if the power cord has been pulled out. I'm not sure what the problem
could be but I have a feeling it is going to be expensive to fix.

Anyone heard of anything like this? Any advice? I've opened the
case and have a fan blowing across the motherboard and CPUs in case they
are overheating but it doesn't seem to help. Temperature Monitor says my
CPUs are running at 20 degrees celcius which doesn't some high to me.

Any and all help would be appreciated.

What OS? :)
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From Newsgroup: comp.sys.mac.system

try resetting the PMU (power management unit)

usually a small button near the battery
unplug the machine, push the button.
close the cover, restart

good luck

foo wrote:

On Wed, 02 Jul 2003 21:19:54 GMT, Bjorn Nitmo <bjorn@deepsky.com>
wrote:

My Power Macintosh G4 (gigabit model with dual 450MHz CPUs has >>started to exhibit strange behaviour. It just shuts down with no warning
as if the power cord has been pulled out. I'm not sure what the problem >>could be but I have a feeling it is going to be expensive to fix.

Anyone heard of anything like this? Any advice? I've opened the
case and have a fan blowing across the motherboard and CPUs in case they >>are overheating but it doesn't seem to help. Temperature Monitor says my >>CPUs are running at 20 degrees celcius which doesn't some high to me.

Any and all help would be appreciated.

What OS? :)

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From Newsgroup: comp.sys.mac.system

I don't know about desktop Macs, but with any system shutting down for
no apparent reason I would check to make sure ALL fans are working and
STAY working (i.e. you're looking for a bad bearing that might be
seizing up after some amount of run time), especially the fan inside the
power supply (I assume there actually is one in there).

Also check all mate-n-lok power connectors for improper fit, including
the possibility of pins backing out of their host (nylon) carriers.
I've seen that a few times. Reseating every power connector wouldn't
hurt; make sure the internal pins actually mate rather than just touch.

QH

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From Newsgroup: comp.sys.mac.system

Fetch, Rover, Fetch wrote:

try resetting the PMU (power management unit)

Zapped the pram, reset the PMU, sacraficed a chicken, all to no
avail. I must get this dealt with. If I wanted a computer that crashed for
no reason, I would run Windows. (Yeah, cheap shot, I know.)

--
Bjorn Nitmo <bjorn@deepsky.com>
Yes, my name is Bjorn and no, I don't work at Ikea.

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From Newsgroup: comp.sys.mac.system

On Thu, 3 Jul 2003, Neill Massello wrote:

Bjorn Nitmo <bjorn@deepsky.com> wrote:

My Power Macintosh G4 (gigabit model with dual 450MHz CPUs has started to exhibit strange behaviour. It just shuts down with no warning
as if the power cord has been pulled out. I'm not sure what the problem could be but I have a feeling it is going to be expensive to fix.

Anyone heard of anything like this? Any advice? I've opened the case and have a fan blowing across the motherboard and CPUs in case they are overheating but it doesn't seem to help. Temperature Monitor says my CPUs are running at 20 degrees celcius which doesn't some high to me.

Any and all help would be appreciated.

To eliminate the possibility that this is being caused by intermittent glitches on your AC power line, are you using a UPS (Uninterruptible
Power Supply)?

Or dodgy cables, plugs which have worked themselves loose etc...

Fred

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From Newsgroup: comp.sys.mac.system

In article <slrnbg8o91.mie.bjorn@maul.deepsky.com>,
Bjorn Nitmo <bjorn@deepsky.com> wrote:

Neill Massello wrote:

To eliminate the possibility that this is being caused by intermittent glitches on your AC power line, are you using a UPS (Uninterruptible
Power Supply)?

Yep. It's not the availability of power.

I had similar, random shutdowns when my UPS battery gave out after
seven years of good service. A new UPS solved the problem.

jim
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