Would overheating cause G4 to go into Sleep mode?

I recently refurbished my old Power Mac G4 (MDD) with new cooling fans and hard drives, then gave the computer to a friend. He lives in a hot climate, and says that the G4 has recently been going into Sleep mode without warning. When he clicks the mouse to wake it up, it will run for about 1 minute, then go into Sleep mode again. Thankfully, he's not losing any data, since it's just going to Sleep, but obviously this makes the computer less than convenient to use!
Now, let's just say -- theoretically -- that I wasn't entirely sure of myself when installing the new cooling fans (120mm case fan and two 60mm power supply fans), and there is a possibility that the new fans may not be cooling the G4 properly.
Would overheating cause the G4 to go into Sleep mode like this? Or should I be looking for another culprit?
Thanks for any advice.

I lugged the G4 around town to three different computer repair shops, and they all confirmed that I had installed the fans correctly, and all fans were running fine. Of course, this only makes the problem harder to solve.
Furthermore, my friend was using the G4 last night when it was a cool 72 degrees (F) in his apartment, and the computer still forced itself into Sleep mode after just over an hour of use. He was using Final Cut Pro at the time, editing a project spread across two external FireWire hard drives. I just can't imagine this amount of activity overheating the G4, which was my editing workhorse for six years before handing it over to my friend.
When I replaced the cooling fans, I did select new fans with slightly lower airflow than the original fans (which many people have replaced, due to the amount of noise they produce). Any opinions on whether that could be the issue?
_Case fan:_
Original: 151.85 CFM airflow
Replacement: 109.6 CFM airflow
_Power Supply fans:_
Original: 38.1 CFM airflow
Replacement: 26.5 CFM airflow

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Back to the beginning, then. Are you certain the Powerbook is actually sleeping? Is the sleep light pulsing? If not, the problem is that your backlight is going off, not that the PB is going to sleep. That would most likely indicate a bad inverter board. When the backlight goes off, shine a bright light on the screen, or shine a bright light through the Apple logo from the back side of the display. Can you see the screen image that way? If so, replacing your inverter will probably solve the problem — and if the inverter is failing, nothing else will.
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Purchased from Apple, refurbished 2012 Mac Tower Pro. At the same time, purchased a new Dell U2713HM, 27" monitor.
Have been operating on this new system since about the first week of December 2013.
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I apologize for the angst. The problem has cost too much money in lost time and material because when it would automatically shut down after a few minutes, all my work was lost.
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This question was solved.
View Solution.

Hello Banna1981,
Welcome to the HP Forums, I hope you enjoy your experience! To help you get the most out of the HP Forums I would like to direct your attention to the HP Forums Guide First Time Here? Learn How to Post and More.
I understand that you think your computer is going in and out of sleep mode yet the monitor stays in sleep mode and both the monitor and computer wake when you use the mouse or the keyboard. I suspect that what you are thinking is the computer waking up is actually scheduled activity or background processes running. If the monitor is staying in sleep mode I do not think that your computer is waking up or if it is it's to process specific activities like checking for updates or checking email etc . . .
If you are concerned I would be happy to assist you, but first I would encourage you to post which operating system you are using. And whether your operating system is 32-bit or 64-bit as with this I can provide you with accurate information on booting in Safe Mode and finding out for sure what is causing this activity.
Which Windows operating system am I running?
Is the Windows Version on My Computer 32-bit or 64-bit?
Please re-post with the requested information and I would be happy to provide you with assistance. Thank you for posting on the HP Forums. Have a great day!
Please click the "Thumbs Up" on the bottom right of this post to say thank you if you appreciate the support I provide!
Also be sure to mark my post as “Accept as Solution" if you feel my post solved your issue, it will help others who face the same challenge find the same solution.
Dunidar
I work on behalf of HP
Find out a bit more about me by checking out my profile!
"Customers don’t expect you to be perfect. They do expect you to fix things when they go wrong." ~ Donald Porter

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Ok, I've followed your advice, gone into the system log, and I think I've isolated the problem (judging from the times that the message was received) to the following:
Jul 30 12:17:55 MyHD kernel[0]: Power Management received
emergency overtemp signal. Going to sleep.
I'm baffled why it would be receiving an overheated signal- the computer is in a cool environment, and on all occasions when it went into these sudden sleeps, it was running a bare minimum of applications. No external hard drives, printers, or anything else connected, either.
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Hi. I'm not sure where to post this so I'll try it here.
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Hey Tecmo_SB_Guy,
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Attachments:
PowerHibernateNever.jpg ‏59 KB

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I'm not really sure how to check the AC current/voltage at home, but my computer worked before I moved it. So I'm not sure if that is the issue.
I normally only have speakers set up to my computer and a wired keyboard. The speakers are powered separately. I would assume that at the Apple Store only the power cord and wired keyboard are connected.
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Sometime in the last week or so my mac mini has started going into full shut down instead of sleep mode.
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Oh yes I just remembered that I did just install 2 8gb of crucial RAM (to replace the supplied 2 2gb but surely that can't have anything to do with it - can it)?

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http://macs.about.com/od/usingyourmac/qt/Resetting-The-Smc-System-Management-Con troller-On-Your-Mac.htm
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Would overheating cause G4 to go into Sleep mode?

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