On Mar 16, 2010, at 2:58 PM, Eric Volker wrote:
I thought I had this problem licked, but it's come back in spades.
My Powermac G5 DP 1.8 (June 2004) keeps shutting down at random,
sometimes at boot. The system log usually reveals "PMU forced
shutdown, reason code -122" or sometimes reason code -88. Moving
the G5 to a different circuit seemed to help for a couple of weeks,
but then the problem came back. Additional Googling brought me to
this page: http://www.xlr8yourmac.com/systems/
Dual_Core_G5_Shutdowns.html#reports. Some of the tricks I've tried
are replacing the video card, resetting the PMU, resetting the
PRAM, reinstalling the OS, installing Linux, and setting Energy
Preferences to Reduced Performance. All seem to work for a couple
of days, but then the system begins rebooting again, or not fully
booting until a PMU reset is performed (I eventually yanked the
PRAM battery so I don't have to do that every time it gets hosed
up.) My latest attempt at fixing it is to reseat the logic board
power connector (suggested on the page above.) So far the system
has been up for a day and a half, but I'm fully expecting it to die
again. Oh, the system is not on a UPS or power strip - it's
currently plugged directly into the wall.
Which brings me to the question, what is the likely cause of all
this grief? Do I need to replace the logic board, the PSU or some
other component? Or would I be better of giving up and selling it
for parts?
I've also had another problem with this G5. Since it originally
contracted this sickness, it's killed two hard drives (though one
of them was already marginal.) I've noticed that when the G5 goes
to sleep, every 2-3 minutes I can hear the drive spin up and go 'ka-
thunk'. That's with a vanilla Leopard install and no additional
apps installed on a known good drive. I also heard the problem on
the previous drives, but didn't do anything about it.
Any help would be appreciated before I take this thing on a long
ride up a tall building...
Eric
Have you tried running off an external HDD to isolate the internal
drives? I just went through this exact problem
on a G4 Cube. I took apart the whole Enchilada and cleaned and re-
seated all components. I even put in a KNOWN good drive
but it still did it only it ran a little longer before acting up. It
turned out to be the hard drive after-all. So actually I ran into 2
bad drives in a row. Maybe the power supply is getting tired, Be sure
if you run it on an external to test you use a powered drive.
JOHN CARMONNE
Yorba Linda USA
sent from my Wally 10.4.11
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