Forums | MacLife

K-Man · 2003-11-22 11:36 am

I was transferring my cassette audio book to a cd via Sound Studio 2.1.1.

Had to step out for a bit and and returned home to find the G5 "screaming" (all fans at full tilt) and the error message..."You must Restart your Computer". I didn't think the G5 could make that much noise...and I mean loud!

I then shutdown the G5 by holding the power button in and restarted without a problem, except of course for losing what I had recorded which was no big deal.

I'm not sure what caused the crash but it was rather discerning to say the least. I wonder what would've happened had I not returned home when I did.

I've been leaving my G5 on while away at work with a few apps running but after this incident I'm not sure that's such a good idea. shrug

Any thoughts?

Thanks

Short Circuit · 2003-11-22 11:40 am

confused

Wierd, never had that happen to me...
It must be a wierd outcome of a kernel panic.

The processor fans are OS controlled, so when the OS freezes, hardware could take over shrug

W

smilr · 2003-11-22 11:42 am

The fans in the g5 are controlled in software by mac os 10, if you were to somehow trick os 9 into working on that machine, or to install linux without proper fan management software the fans would make the same noise: as they will run at full capacity when they don't have instructions from the OS, as a precaution against overheating.

I wouldn't worry about it unless the noise would be a problem in case of a crash going unnoticed for a long period of time. I doubt the machine was in any danger of overheating, just that the fan controllers couldn't get instructions from a crashed os, so they defaulted to overkill in order to prevent any possible damage.

pcguy · 2003-11-22 11:49 am

I have voice concern about all those fan "the more one put in a system, the more chance something screw up" before, but what I really don't understand is why the os control of speed/temp and not build in temp/sensor fan, quite a few heatsink/case fan have build in temp sensor to control fan speed in computer world, those temp sen fan shouldn't cost Apple more then a few penny extra.

sparkn · 2003-11-22 3:58 pm

I have voice concern about all those fan "the more one put in a system, the more chance something screw up" before, but what I really don't understand is why the os control of speed/temp and not build in temp/sensor fan, quite a few heatsink/case fan have build in temp sensor to control fan speed in computer world, those temp sen fan shouldn't cost Apple more then a few penny extra.

The fans are hardware controlled. They are throttled by software. In the event that software loses control (such as a kernel panic), the fans all lock on high until the system is reset. This results in much more flexibility and control over the fans than a full "hardware" solution and is fail safe (well, NOTHING is completely fail safe). Hardware controllers are not nearly as fail safe although an actual failure is less eminent.

ColPanic · 2003-11-22 4:20 pm

I bet it wasnt as loud as my Dual867 is while booting up.

mjsmitho · 2003-11-22 4:39 pm

I bet it wasnt as loud as my Dual867 is while booting up.

I have a dual gig that runs full tilt, at all times, and I have put my G5 in target disk mode(no fan control). The fans do indeed scream, but it is a different loud than a Quicksilver. I would say the QS's a little louder than the G5, sans fan control.

ColPanic · 2003-11-22 4:58 pm

The Dual867 isnt a QS, its a MDD (old pic, my setup has improved, new speakers/phone/ipod etc) AKA a WindTunnel

I am twelve years old · 2003-11-23 12:00 am

G5s only "scream" in the sense that they are fast!.

mjsmitho · 2003-11-23 12:36 am

The Dual867 isnt a QS, its a MDD (old pic, my setup has improved, new speakers/phone/ipod etc) AKA a WindTunnel

Yeah my bad, I have had 4 G4s at work in the past year, I think the loud one was a MDD, but can't remember. It is sitting in the back waiting for a good use. None of our users can stand to work with it in there cubes, and I have gotten a G5. I am going to set it up for use in the server room where it will go unnoticed and be loved. cry

dhack21 · 2003-11-24 5:24 pm

Finally another Emag user smile Go indigo!! Very nice setup btw and the g5 is a beast when its overdrive... but not as bad as a QS

K-Man · 2004-01-04 7:14 am

Any other Dual 2GHz G5 owners experience this?

Madsculptor · 2004-01-04 9:44 am

I bet it wasnt as loud as my Dual867 is while booting up.

Whoa, I bet it was 3x louder than your MDD. It's the most insane noise you've ever heard. My floor was rumbling in target disc mode. It's like 3 hair dryers running full tilt. eek

Marc · 2004-01-04 2:35 pm

Any other Dual 2GHz G5 owners experience this?

yeah, it was a kernal panic, it happened and then the fans went full tilt because it doesnt know what the PCU temp is after a kernal panic and it does that to make sure it doesnt overheat. Its a good thing.

Forums | MacLife

#1 2003-11-22 11:36 am

Screaming G5

#2 2003-11-22 11:40 am

Re: Screaming G5

#3 2003-11-22 11:42 am

Re: Screaming G5

#4 2003-11-22 11:49 am

Re: Screaming G5

#5 2003-11-22 3:58 pm

Re: Screaming G5

#6 2003-11-22 4:20 pm

Re: Screaming G5

#7 2003-11-22 4:39 pm

Re: Screaming G5

#8 2003-11-22 4:58 pm

Re: Screaming G5

#9 2003-11-23 12:00 am

Re: Screaming G5

#10 2003-11-23 12:36 am

Re: Screaming G5

#11 2003-11-24 5:24 pm

Re: Screaming G5

#12 2004-01-04 7:14 am

Re: Screaming G5

#13 2004-01-04 9:44 am

Re: Screaming G5

#14 2004-01-04 2:35 pm

Re: Screaming G5

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