Currently Being ModeratedNov 29, 2012 1:05 PM (in response to aronfromtoledo)
Yes, it sounds as if the cache has failed on that particular processor.
The other message with the switched processors may be due to the ability of that model to run on one processor (physically).
Currently Being ModeratedNov 29, 2012 4:09 PM (in response to japamac)
Thanks, japamac, for the quick reply. I have another question. I ordered a CPU, so I'm waiting for that. The computer still works, after a fashion, but now the fans go full speed all the time. Am I risking damage to anything if I keep using the computer with the fans running like that?
Currently Being ModeratedNov 30, 2012 1:43 AM (in response to aronfromtoledo)
You might be able to disable the bad processor in the short term (I have in my G5 1.8 dp)
Kudos to japamac in that thread too!
Have been running on one processor for 6mths at least and have finally got the parts to try and replace the dodgy processor myself.
Currently Being ModeratedNov 30, 2012 3:14 AM (in response to westerneyes)
The linked discussion has old formatting that shows asterisks instead of bold typeface; not good for a Terminal command.
The commands are:
$ sudo nvram boot-args="cpus=1" to disable
To re-enable the 2nd cpu $ sudo nvram boot-args=""
Currently Being ModeratedNov 30, 2012 3:15 AM (in response to aronfromtoledo)
The fans are just noisy and will keep anything from heat damage.
There is little risk of further damage, especially with the errant CPU disabled via Open Firmware or Terminal.
Currently Being ModeratedNov 30, 2012 5:52 PM (in response to aronfromtoledo)
Thanks westerneyes and japamac for the replies and information. I tried to disable the bad processor using the Open Firmware method, but I couldn't get the machine to boot into OF. That may because I have issues with the keyboard not working, even on a normal boot, until I unplug and re-plug the USB connector after the sign-in screen appears (could be I should plug it into the tower, rather than the display).
Anyway, I removed the bad processor and booted with only the one processor in the top slot. So far the computer seems to be running normally (if slowly) and I've been able to sleep it and wake it. The fans, however, are running at full speed. I was hoping that without the bad processor, the fans would behave normally (ASD says that the good processor does not need calibration).
Do you know if there's a way to run with only one processor installed AND have the fans behave normally. The constant noise sets me on edge.
Currently Being ModeratedDec 1, 2012 2:17 AM (in response to aronfromtoledo)
If you get a copy of the ASD 2.5.8, you can run thermal calibration as desired; no limitations like 2.5.7.
Currently Being ModeratedDec 1, 2012 10:50 AM (in response to japamac)
japamac - thanks for the reply, and your continued interest in this discussion. Actually, we had a power failure last night (winter storms), and this morning the fans are better - still running fast, but not at full speed.
I had understood that I needed ASD 2.5.7, and that 2.5.8 would not work on my computer (a 2003 PowerMac G5 2.0 GHz dual processor running OS X 10.5.8). Did I have the wrong information about this?
Currently Being ModeratedDec 1, 2012 5:22 PM (in response to aronfromtoledo)
The 2.5.7 is the first that supported your machine, thus recommended. The 2.5.8 supports later as well as earlier machines and removes the limit on when thermal calibration can be run.
Currently Being ModeratedDec 2, 2012 11:02 AM (in response to aronfromtoledo)
Thanks japamac & BDAqua. I just downloaded ASD 2.5.8 last night; haven't had a chance to try it yet. I'm hoping that it will recognize that there's only one CPU, and shut the fans down for the missing one. I'll try it later today, and let you know.
Currently Being ModeratedDec 2, 2012 4:56 PM (in response to aronfromtoledo)
Well, I tried using ASD 2.5.8. It wouldn't calibrate, giving me the EEPROM checksum error on CPU0. That's strange, as I've got the CPU that was testing okay in CPU0 slot, and no CPU in CPU1. I also notice that it gives me less information about the CPU when I choose the Hardware Information menu - it doesn't give me serial numbers, and lists the top processor speed as 1152 MHz, when it should be 2000.
I'm hoping this is a combination of having only one processor and something strange with ASD 2.5.8 and my machine. Otherwise I'm facing the issue of the second CPU going bad in a few days - maybe the logic board is destroying CPU0?
Anyway, I'm expecting a replacement CPU tomorrow. Perhaps with two in there, things will work.