1228 Views 7 Replies Latest reply: Oct 6, 2006 6:41 AM by Andy Kynerd
Check system.log in your Console application for lines like "Power Management received an overtemp signal. Going to sleep." or "localhost kernel: PowerMac7,3 Thermal Manager: Thermal Runaway Detected: System Will Sleep. You may have a processor(s) overheating and putting the G5 in thermal shutdown.
Mac Owners Support Group
Join Us @ MacOSG.com
ITMS: MacOSG Podcast
An Apple User Group
Thanks for the advice. I did check the system.log in Console and found the following altert:
PMU FORCED SHUTDOWN, CAUSE = -122
Now, since my computer is just over a year old, and since this problem happened immediately after applying the 10.4.7 OS update, I found it hard to believe that my hardware could be responsible. After 2 days of troubleshooting, I was stumped; after a 2-hour service call, so was Apple tech support. I ended up doing an archive and install back down to 10.4.5, and all is well.
I tested this issue on other machines running 10.4.7 and had no problems. It seems that the following specific combination of elements triggered the problem:
• PowerMac G5 dual 2.3 GHz (dual 1.8 machines did not exhibit the same problem)
• OS 10.4.7
• Logging in with Open Directory/Active Directory mobile profiles
• iTunes 7
Bottom line: if you’re using a dual 2.3 GHz PowerMac with mobile OD/AD profiles, do not update to 10.4.7, and steer clear of iTunes 7, at least until there is a patch update available.
(And Apple wants to be taken seriously in the enterprise market?)
G5 dual 2.3 GHz Mac OS X (10.4.7) 2.5 GB RAM, 250 GB HD
I am having the same issue with my non-dual G5. For the last week, I have unexpected random shutdowns. I checked the console log and there is a line that says
SMUNeo2PlatformPlugin::initThermalProfile - calilng adjust
That is the only line that has the word "thermal" in it and I have no idea how to interpret it.
Another odd thing in the last week - my system seems to be renaming Word docs - giving them names of other files (some are pdfs) but none of which are open at the time. I haven't renamed them either so I have no idea why this is going on.
Are they related? How shall I remedy each of them?
iMac G5 Mac OS X (10.4.2)
I have a similar problem. Over the last couple of days, my (three-month-old)G5 display goes black and the CPU either starts making this loud clicking noise or it sounds like a plane about to take off. At this point, I press and hold the power button on the CPU until the system shuts down completely. I wait a few minutes before restart, and so far, the system starts back up wihtout any problems. I just checked the system log (after restarting a few moments ago) and found this:
Oct 5 12:20:42 localhost kernel: PowerMac112ThermalProfile::start 1
Oct 5 12:20:42 localhost kernel: PowerMac112ThermalProfile::end 1
Oct 5 12:20:42 localhost kernel: SMUNeo2PlatformPlugin::initThermalProfile - entry
Oct 5 12:20:42 localhost kernel: SMUNeo2PlatformPlugin::initThermalProfile - calling adjust
But I have no idea what any of this means. Anyone have any ideas on what could be going wrong? I'm definitely not digging the noises coming out of this thing. Should I be concerned?
OK, I have to amend that last post. I just did a "test" to observe exactly what's going on and here's what I know:
System is set to run the screensaver after 15 minutes (and it does so without any problems). Energy saver is set to put the system and display to sleep at 20 minutes. This is where we have the problems. The system appears to go into sleep mode (diplay goes dark), but immediately starts making the awful clicking sound. It continues making this sound until I push the power button on the front of the CPU. Pushing the power button (just once)causes the clicking noise to stop and the system appears to be sleeping normally. After a minute or so, the loud fan noise begins (sounds like the whole thing's about to take off) and continues until I press and hold the power button (force shutdown). So far, these results appear to be consistent.
I have no clue as to what this could be. As I mentioned, this is a relatively new G5 (three months old) and barely used at that. Any ideas on what I might be dealing with here?
If you're seeing anything with "thermal" in the system.log, you should probably take your computer in for service.
My problem, on the other hand, has never generated any "thermal" system.log entries, just random PMU shutdowns. All this, plus the fact that this problem only happens with OS 10.4.7 and 10.4.8 convinces me that it's software related.