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G5 Starts Up only Once Per Day Error post/192/0

360 Views 7 Replies Latest reply: Dec 5, 2012 2:30 PM by JimmK RSS
JimmK Calculating status...
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Nov 15, 2012 6:46 AM

I have a G5 2.7 Dual with Start Up problems. It will start only after being off for at least 12 hours or so.  On a command of restart, it wil try, but never gets to the point where the chime would be heard, and no possible way to get it going again except to wait overnight.


I have replaced the battery, reset the PMU, reseated the memory, tried to start with just 2 DIMMS, reseated the video card. The power button does not show any blinking, but will glow when pressed. The machine can be turned off by holding the power button. The fans gradually increase in speed while nothing else happens.


This morning I booted from the Apple Hardware Test CD. A logic board error was reported immediately, without even starting the test. It is


Error Code post/192/0.


When the Extended Test on Apple Hardware Test is run, the Logic Board passes. This is confusing.

Can anyone tell me about this code and whether a repair is doable?

PPC G5 Quad, Mac OS X (10.4.11)
  • BDAqua Level 10 Level 10 (114,665 points)
    Currently Being Moderated
    Nov 15, 2012 10:06 AM (in response to JimmK)
  • BDAqua Level 10 Level 10 (114,665 points)
    Currently Being Moderated
    Nov 15, 2012 12:49 PM (in response to JimmK)

    Do we get the same error if we wait a day & use AHT instead of booting up?

  • japamac Level 7 Level 7 (24,390 points)
    Currently Being Moderated
    Dec 5, 2012 1:49 PM (in response to JimmK)

    Is the 7800 an OEM 7800 GT or is it a WinPC card and has the 7800 been flashed to Mac ROM? If not, it won't work.

    Did you connect auxillary power to the 7800?


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