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View Full Version : random freezes, fans spinning up to full speed on G5




loganb
Oct 2, 2006, 03:07 PM
I have a 1.8Ghz dual processor G5, 1GB Ram, 80GB HDD, with OS X 10.4.7 installed and all current updates, and today I was working on it and the fans on it slowly started speeding up, and then everything on the screen disappeared and a mesage appeared stating that a restart was required. After restarting everything seems to be working fine, but I'd like to know if this is a fluke or if I have a serious problem.



Josias
Oct 2, 2006, 03:09 PM
Sounds like an ordinary kernel panic to me. I've had this twice on my MB. Really nothing to worry about.

The fan thing sounds odd though, but I wouldn't worry too much.;)

loganb
Oct 2, 2006, 07:41 PM
Thanks for the reply, I found the panic and here's the error report that it gave me.

panic.log:

Description: Panic (system crashes) log
Size: 8.11 KB
Last Modified: 10/2/06 7:38 PM
Location: /Library/Logs/panic.log
Recent Contents: ...
PC=0x000343C0; MSR=0x00001030; DAR=0x00000073; DSISR=0x40000000; LR=0x00034510; R1=0x1CDE3D50; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x02347C60 0x00034510 0x00034274 0x000A9694
Proceeding back via exception chain:
Exception state (sv=0x356FAA00)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x00E4EA00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

Kernel version:
Darwin Kernel Version 8.2.0: Fri Jun 24 17:46:54 PDT 2005; root:xnu-792.2.4.obj~3/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x00095544 0x00095A5C 0x0002683C 0x000A819C 0x000ABB00
Proceeding back via exception chain:
Exception state (sv=0x356FAA00)
PC=0x000343C0; MSR=0x00001030; DAR=0x00000073; DSISR=0x40000000; LR=0x00034510; R1=0x1CDE3D50; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x02347C60 0x00034510 0x00034274 0x000A9694
Exception state (sv=0x00E4EA00)
PC=0x00000000; MSR=0x0000D030; DAR=0x00000000; DSISR=0x00000000; LR=0x00000000; R1=0x00000000; XCP=0x00000000 (Unknown)

Kernel version:
Darwin Kernel Version 8.2.0: Fri Jun 24 17:46:54 PDT 2005; root:xnu-792.2.4.obj~3/RELEASE_PPC

loganb
Oct 2, 2006, 08:05 PM
Ok, it just happened again. I was working on my PC and I heard the fans on the G5 begin to slowly speed up, so I switched to the Mac and the fans slowly spun up over the course of about a minute until they were running full speed. The computer froze and I couldn't use the keyboard or mouse, and finally I restarted it. I just updated to Tiger 10.4.8, could this have anything to do with it? I also pulled the side panel off when it did froze and when I pulled the clear plastic air flow piece all the fans but the hdd fan dropped down to normal idle speed and the red hardware problem led lit up, and the hdd fan stayed on high. When I replaced the clear air flow piece, the led turned off and all the fans kicked back up to high. This has never happened before today in the 3 weeks I've had it, and its now happened 3 times today, once before updating to 10.4.8 and twice after.

iMeowbot
Oct 2, 2006, 08:12 PM
I know that you just posted a log, but one from 10.4.8 would be more useful (because the addresses will match more people's computers). The addresses might help to shed light since no function names are listed.

loganb
Oct 2, 2006, 08:24 PM
I just updated the log post with the most recent entry from the panic.log I hope that helps, I'm more of a PC guy and am still learning on the mac's.

iMeowbot
Oct 2, 2006, 08:56 PM
Ouch, that's pretty deep down, in the scheduler. You're crashing in the middle of what looks like a fairly boring task switch.

This would be a good time to boot from your installation DVD, fire up Disk Utility, and verify that the disk is in good shape. The kernel is trying to wander off into imaginary addresses, that simply shouldn't happen.

If you still have your hardware test disc, it would be a good time to see what that has to say too.

loganb
Oct 2, 2006, 09:11 PM
Well I was given this computer and do not have any of the original discs that it came with, so is there any way I can download a hardware test disc or some thing that would allow me to test the hardware and the disc?

iMeowbot
Oct 2, 2006, 09:21 PM
I don't know of a legal way to get a replacement hardware test disc except through Apple support. Is there an Apple dealer nearby where you could make an appointment and bring the machine?

You can still run Disk Utility and verify the disk from the regular startup (assuming that the machine stays up long enough). Repairing may be tougher, but let's see what that has to say first.

See here (http://docs.info.apple.com/article.html?artnum=106214) about using fsck from single user mode, if Disk Utility reports problems.

clemn
Oct 2, 2006, 09:35 PM
just had a very similar pb on my quad g5. Intermittent, and then more and more frequent crashes, even after system update etc ... I actually found that the video RAM was faulty (on my expensive quadro fx card) using Techtools deluxe (in fact testing the VRAM caused systematic crashes). I opened the box and found a considerable amount of dust inside, in particular on the exhaust of the graphics card ventilation. I cleaned carefully everything, and have had no crashes anymore.

Someone in my lab fixed his PC crashes exactly the same way, apparently computer engineers haven't found a way to protect computers from this kind of stupid pb ...

___________________
quad g5 2.5GHz
16Mb RAM
raptor 10k 74Gb bootdrive
quadro fx GPU

iMeowbot
Oct 2, 2006, 09:40 PM
I opened the box and found a considerable amount of dust inside, in particular on the exhaust of the graphics card ventilation. I cleaned carefully everything, and have had no crashes anymore.
That sounds like a problem I had with a TV set a loooong time ago. The cat used to like to sleep on top of it, and one of his whiskers fell in (while no longer attached to the cat, no fried kitty in this story!!). I never knew those suckers were so conductive!

loganb
Oct 2, 2006, 11:04 PM
Ok, well when I get back to my computer tonight or tomorrow morning I will blow out the computer and run the disk utility check and attempt to verify the hard drive. I don't think there are any Apple repair facilities within 2 hours of me, there is 1 sales location, but they only sell, they don't repair. I'll post again as soon as I have a update.

loganb
Oct 3, 2006, 08:00 AM
I was able to boot into single user mode in order to get to the command prompt line, and was able to run fsck, and it said no problems, ran it again to be sure and again said there were no problems. Now while running fsck the first time the fans started spinning up to their full volume roar, and had I been in the graphical enviroment and not the command prompt it would have froze, but while in command prompt I was still able to run finish that fsck check, and run another, then reboot without any problems. I'm going to get a can of compressed air today and blow out the computer good and see what that does. Any have any other ideas?