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My Dual 2.0 G5 keeps going to sleep during high processor moments.
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Forum Regular
Join Date: Sep 2003
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My main editor is giving me trouble. Anytime I do something processor intensive, like rendering, the machine will just go to sleep. So I have to wake it up and let it go a bit longer, then it'll fall asleep again, rinse and repeat.
Any ideas? I've got 1.5 GB RAM in and took out all but the stock RAM and the same thing happens. I've monitored the temps and can't really tell that anything's getting too hot. I've put a giant fan in front of the tower in an attempt to cool it off, but no change.
Help me Obi-Wan Kenobi, you're my only hope!
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Grizzled Veteran
Join Date: Mar 2003
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Have you checked your Energy Saver settings? Is it processor intensive things, or things that take a long time?? Is it really sleeping or just blanking your screen?
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MacBook and iMac Core 2 Duo 24"
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Forum Regular
Join Date: Sep 2003
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It's processor intensive. I will start something rendering and it will go to sleep, I will wake it up and maybe it will stay up for a few seconds then it will go to sleep again. Sometimes it will stay up for a few minutes, sometimes it won't go back to sleep at all. Has nothing to do with taking a long time or anything, it could be a render that takes 30 seconds but it could be enough to shut it down.
It's not like I'm saying that my computer goes to sleep every 30 minutes and I can't figure out why.
It's not the display, it's the machine.
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Forum Regular
Join Date: Jan 2003
Location: Hong Kong
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There maybe some problem such as overheating inside your computer. Open the cover and see if the fans next to the G5 processors are working or not. The OS has designed to put the computer to sleep if it detected overheating. Contact Apple if you found it's hardware related issue.
You may also want to download an application to monitor the CPU temperature. For instance, you may try out Temperature Monitor. It can be found at http://www.versiontracker.com. Try to start a rendering and monitor the temperature of your process dies' changes.
D.
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Admin Emeritus  Join Date: Oct 1999
Location: Zurich, Switzerland
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Originally Posted by ddma
There maybe some problem such as overheating inside your computer. Open the cover and see if the fans next to the G5 processors are working or not. The OS has designed to put the computer to sleep if it detected overheating.
Just a minor correction: it's not the OS, but rather the PMU that manages this. (This was done so that even if the OS has fully crashed, or another OS without heat management is being run, the machine will not damage itself.)
tooki
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Mac Elite
Join Date: Oct 1999
Location: near Boulder, Colorado
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Just a stab - try installing the developer kit. You get a control panel called "processor" and one of its settings is "enable nap" - I always turn it off after a restart(it resets to "on")
Z
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Admin Emeritus Join Date: Oct 1999
Location: Zurich, Switzerland
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No, this problem is a no-brainer: when a CPU overheats, the system responds by going into deep sleep until it has cooled down sufficiently. It's a hardware problem, without doubt.
tooki
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Forum Regular
Join Date: Jul 2003
Location: East Lansing, MI
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As tooki said, it's a hardware problem, plain and simple. The machine is broken and in need of repair.
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Your Mac could help understand and cure disease
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Forum Regular
Join Date: Sep 2003
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Yeah, I do fear it's a hardware problem but the machine's out of warranty so I'm worried about the cost to fix it.
As it is now, it's an issue I can work with (it just takes a loooong time to render stuff).
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Mac Enthusiast
Join Date: Jul 2005
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Your machine is overheating. Letting it overheat consistently probably isn't good for the life of the machine.
See if the fans are turning, and see what your CPU temps are. If it's just a couple failing fans, the problem shouldn't cost THAT much to fix.
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Forum Regular
Join Date: Sep 2003
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Ok, just looked at the fans:
http://617pg.com/tivo/fans.mov
The top one will speed up more than it is here, but it never works like the bottom one. Additionally, when I feel the back of the machine for airflow, the bottom vent feels very strong and I can barely feel anything coming out of the top.
Is a replacement fan the next step? Looks like I can get one for under $100.
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Mac Enthusiast
Join Date: Jul 2005
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Try running the Apple Hardware Test and see what happens.
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Mac Enthusiast
Join Date: Apr 2001
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Originally Posted by Bryanmc
Ok, just looked at the fans:
http://617pg.com/tivo/fans.mov
The top one will speed up more than it is here, but it never works like the bottom one. Additionally, when I feel the back of the machine for airflow, the bottom vent feels very strong and I can barely feel anything coming out of the top.
Is a replacement fan the next step? Looks like I can get one for under $100.
Do not spend any money yet because It could simply be that the calibration needs to be redone.
In that case you need to run the G5 diagnostics DVD to re-calibrate.
It could be the heat sink came loose also.
If you are near an Apple store they should be more than happy to give you a G5 diagnostics
DVD if you do not have one. If they will not they will tell you to bring your mac in and they will
run it there maybe even do it for free since it is so simply to do and is all done by the diagnostics app.
If the fan is bad buy the part and do it yourself if it something more like a bad thermal diode well...
good luck
BTW - I'm very curious as to what temp readings you are getting right before the shut down.
What are you getting temp wise and is it both CPU's or just 1 of them that is real high?
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Dedicated MacNNer
Join Date: Jun 2001
Location: Paris, France
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Are there any lights on inside it???
I had a problem with narcolepsy that turned out to be a processor....
Discussed in this thread...
Red Light Woes
Regards,
Jordan
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iPod Photo 60GB + 1Gb iPod Shuffle + iPod/3G/15GB + iPod Mini (Silver)
24" iMac 2.8Ghz/2GB/SuperDrive
Mac mini 1.66Ghz Intel Core Duo/1GB/SuperDrive + iPod Nano (Black)
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Mac Enthusiast
Join Date: Apr 2001
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Originally Posted by OogaBooga
Try running the Apple Hardware Test and see what happens.
yes that is a good idea but IIRC the re-calibration software is not on the basic Apple
Hardware Test DVD so you may need the ASD one. (been so long since i looked I forget)
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