PowerPC :: Random Freezes - Fans Spinning Up To Full Speed On G5
Oct 2, 2006
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.
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Sep 3, 2010
My step-son works for a company that uses a variety of computers in their test dept. and when they upgraded the test equipment they gave the old stuff to employees.My step-son is a dyed-in-the-wool PC guy who doesn't care for Macs so when he saw a G5 PPC sitting there he took it home and gave it to me.
It's a 2.0 GHz dual-processor with 8x AGP video. I checked it out and the only thing "wrong" with it is that someone has set up the fans, all of them, to run full-speed all the time.First, how did they most likely do that and, second, how can I return the fans to their normal operation. This can't be good for the computer and it's so loud and annoying that I'd rather use my G4.It's a great computer otherwise, I hope they didn't do something permanent that would require a new motherboard, that's not in my budget.
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Jun 25, 2010
My PCI bay fan is running at full speed no matter what. The temperature sensor reads correctly in OS X, so I don't think it's a bad sensor.
Is there any way to set the fan speed manually, say in openfirmware?
It's a 1.8 DP June '04; I've ran ASD 2.5.8 to calibrate and test the mobo, which passed.
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Dec 13, 2009
For a few days now, my 13" MBP (purchased in August; painfully clean-install upgraded to Snow Leopard in October) has been freezing into spinning wheel mode randomly every few minutes. It would seem that this happens particularly often in web browsers (but also when no browsers are operating and I'm typing away in Text Edit or chatting in Adium and Skype). When the browsers are on, the FlashPlayer would occasionally crash. No matter what app froze first, whatever else I click on also freezes.
The freezes happen most frequently after the computer has been to sleep and woken up by opening the lid. The wheels go spinning for up to two minutes, and then everything goes back to normal (for up to 3 mins before freezing again). The longer the comp operates after that, the rarer they become, and after a few hours they rarely happen at all (then again, some times they do anyway). On some occasions, everything freezes so badly I need to hard-reset, and then it takes the comp upwards of 15 minutes to reboot - and then everything keeps freezing, of course. Contrary to other reports of similar problems here, no CPU jumps appear to be happening during the freeze. I tried:
- Running Disk Utility after booting from Snow Leopard . Some permissions (which in forums here were referred to as inconsequential / not related to freezes) were repaired; HD in general "seems to be ok."
- Running RAM tests (with Rember, supposedly updated to Snow Leopard). Everything seemed fine
- Getting rid of the ARD agent (which was related to some of the permissions mentioned earlier)
- Stopping Bluetooth (as someone here with a similar problem thought it helped)
- Installing the Beta Adobe Flash Reader (same as above)
Nothing helped. I really don't want to take it to the lab; I live in Israel and the comp was purchased in the States, which means that the only licensed lab here reserves the right to keep the comp for up to 26 working days
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Feb 16, 2012
Exactly the same issue on Macbook Air and new iMac both running Safari 5.1 and Lion 10.7.3Â
When I open Safari it does not open a page, it just shows a spinning beach ball and shortly after the fans kick in and the activity monitor shows 1 webprocess at 99 - 100% or sometimes 2 web processes at 50/50% all coming from the User. When I inspect the process it says it's "Parent Process (Safari 450)"Â
When I quit safari the web processes stay at 100% and will only stop when I quit them in activity monitor. I have reset Safari but no joy. Firefox etc works fine. The only update I ran was a 1Password update but they say it's not them.Â
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Nov 4, 2010
I've got this weird problem with my late 07 SR 17'' MBP, after I plug in the Magsafe charger the fans start spining and in like 3 minutes they reach 6000 rpm (both of them) and stay that way until it's finishing the charge. I did the same exact tasks with my laptop charged and plugged in, and the fans stay around 2000 rpm, as opposed to when it's charging staying at full speed.
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Mar 27, 2009
Brand new 2009 octo, with the 2.2x ghz CPUs. Turn it on, start NO apps. Let it sit idle. Within a few minutes the fans ramp up to FULL jet engine speed. I can't hear people on the telephone. And never stop. Let me reiterate that I am running NO apps. My load averages are in the zeros.
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May 18, 2012
Machine: iMac intel core 2Â 2.66Ghz Model A1224
sn# YM******ZE3Â
Ran the hardware test by pressing 'D' key. hardware test came back with error :4SN/1/40000000: T00P-65.250Â
I am guessing some sort of temp sensor might need replacing.Â
Info:
iMac
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Feb 28, 2009
I've got a little problem with my iMac 24" 2.8 GHz Nvidia Geforce 8800GS 500GB. When I start it up, the fans start blowing at full speed. I checked the apple support page for support and found my problem with all the symptoms being correct. The support said I had to reset the SMC by shutting down the iMac, then removing the power cord and all the other one's, wait 15 seconds and then put the power cord and the other one's in respectively. I did this almost 10 times, but my iMac still won't stop making those annoying noises. Maybe it has to do with the SMC fancontrol app my brother installed lately.
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Apr 8, 2012
My Mac OS X as soon as I turn it on the fan is running. I have already gone thru the reset SMC . Could I have too much stuff in it?
Info:iMac, Mac OS X (10.5.8), 2.66 GHz Intel Core 2 Duo 4GB 1067
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Nov 5, 2009
I have a 24" mid-2009 iMac, bought in June. It's behaving oddly over the past week or so. It fails to wake on sleep on the first attempt, but always succeeds on the second. When I say fails though, I mean that it *does* wake up, but goes back to sleep again after a few seconds. The other issue happened today, when I woke it up, in a cold room, the fans started up at full speed (I assume). It sounded terrifying to me as my iMac has never got that loud - not even playing games. I restarted it and it was the same, but died down after a while.
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Apr 14, 2010
So today I opened up my MBP to clean it out and stuff (it had a ton of dust... A wall of it had built up where the fans blow out)All is fine and dandy now except for one thing. Since I don't want to open my case up for the second time today (right fan wasn't plugged in all the way first time I started it up... oops x( ) I'm asking here since everything else seems to be fine.
What I did:
Opened everything up all the way down to the heatsink.Applied correct amount of Thermal paste.plugged everything back in (right fan wasn't perfect at first, but fixed and stupidly didn't double check everything else while I was in there)
And now both fans are running at 6k (full) constantly. I tried resetting PRAM and SMC with no luck. I'm about to grab my disk 1 and run the diagnosis to see if that turns up anything.Are there any plugs that I might have accidentally not plugged in all the way or at all that would cause this? Also any other suggestions if everything is plugged in correctly?
MacBook Pro 2,2 15.4" late '06
10.6.3
C2D 2.33GHz
2GB Ram
Also, I have iStat Menu. No apps using all my CPU (Mostly <10% usage right now) and temp is mostly <40c right now. All temps have a temperature so I'm assuming all heat sensors are fine.On a great note: My computer is so much cooler now! Even before this at 6k rpm I'd get down to MAYBE 45c if I was lucky.I also have Fan Control installed and it's not having any effect
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May 25, 2009
I opened up my G5, to install more RAM, and saw that one of the hard drives was unplugged (I just got it used), and so I connected that, blew some compressed air into it, installed the RAM and closed 'er up. Then I tried to power on and it didn't work (No Chimes, just fans spinning, no video, not even the start up chime). So, I disconnected the hard drive, took out the RAM I put in, and closed it, and it still doesn't boot. Same thing. My keyboard is wireless, but the wireless dongle thing doesn't get any power when it is "powered on". The fans are spinning all the time. (Except when it's powered off, obviously)
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Jan 4, 2011
My PowerMac G5 fans hardly ever speed up. I mean they certainly never go full speed or ever close how they sometimes behave on start up. I never get the jet speed noise. Even when I am rendering a movie in FCP, I hardly hear the fans. Right now on idle, iStat pro reports CPU A being 58C and CPU B being 56C. Yet, the fans are still only 400RPM both CPUS Intake/Outake.
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Apr 24, 2007
I have this Power Mac G5 and every now and then it'll freeze up, the fans will go full blast, and the screen will go black. It's not even when I put a heavy load on it.I usually just hold the power button down and do a hard shut down. Does anyone know why this G5 keeps doing this? Should I re-seat the ram and GPU?
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Oct 4, 2007
My girlfriend has a 17" G4 Powerbook - she recently bought it second hand. It's one of the late models, with a 1.67 GHz processor and 2GB of RAM installed. It runs like a dream, except for one thing - it has a propensity to freeze occasionally. They're not kernel panics - they're hard freezes, where everything locks up completely. Can't move the mouse, can't force quit, nothing - the only thing to do is switch off and on again. I've looked through the logs and can't find any crash reports, so I'm at a loss to what's causing this. The only lead I have is that it only seems to happen when the machine's running on battery - it's never frozen when the power cord's plugged in. I thought it might be overheating, but it froze this morning after only 5 mins of use, so now I'm stumped.
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Aug 23, 2008
Fall 2005 PowerMac G5 dual 2.0Ghz with Leopard 10.5.4
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Jan 20, 2008
My menu icons kept flashing on and off for a while. I left the computer by itself for a bit and returned to find the fans blowing at full blast and the cursor wouldn't move. So I pressed the power button to turn off the computer and restarted
My console log showed this repeated about every 30 seconds for about 30 mins
I think the icon flashing was a result of having a film dvd in an external drive like in this thread [URL]
I've ejected a film DVD that was in a Lacie external drive and verified my internal and external hard drives to check for any errors. All were ok.
I'm not too worried about the menu icons flashing but I am bother about the fans blowing like this. The fans have blown at full blast and crashed the computer about 12 times in the last 4 months when I have been away from the computer. So i'm a bit bothered about leaving the G5 alone. I haven't been able to replicate this fan issue - its random. Erasing the HD and installing Leopard doesn't seem to have stopped if from happening (I had the same problem in Tiger)
I have attached a screen capture of my Stat widget below
The slots and backside fans are always stuck at 76rpm and 51rpm. Also CPU A is normally at a high temperature than CPU B. I think the highest i've seen that temperature at has been about 75 but i don't look at it often. These stats were just when I was importing a CD into itunes fans were quietish.
I'm thinking about getting Apple to have a look at my G5 while the Applecare is still valid (it should run out in May).
Can anyone look at their Stats and see if their slot and backside speeds are stuck at similar rpms.
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Aug 10, 2008
i have an ibook g4, and was using it just fine the other night, then when i came back to it a few minutes later it had shut off completely. now when i boot up, the computer freezes at the spinning gear startup screen or at the blank blue screen immediately after the spinning gear. it will boot in single user mode, but it won't boot up with my os x install disc. does anyone know any unix i could try to use to get my mac up and running again, or has anyone had this same problem and knows a fix for it?
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Aug 25, 2007
I have a PowerBook G4 15" 1.33GHz that up until now ran flawlessly. Today I was watching a movie on it with some friends when it randomly shutdown. Since then, it no longer turns on. The battery is fully charged and there is no problem with my AC adapter. With just the battery, nothing happens when I press the power button. When the AC adapter is plugged in and I press the power button, the optical drive spins at full speed for a few minutes and then the PowerBook shuts itself down again. I have attempted reseting pram and pmu with no success. I think it could be a dead logic board but I'm not sure. Would it be worth the money to buy a new logic board or should I just part it out?
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Jul 12, 2009
Ok, so I got a Mac Pro I believe it's a 2007 model or some where along those lines, it's 2.63 ghz quad core.None the less here is what happened.Came home one day to find my USB not working at all it would charge but not connect to the computer.
So I reboot still not working. I turn it off and take a look inside nothing, reseat the ram just to be sure. Ok, turn it on, nothing happens, no screen I hear the fans spinning and the hd spinning.So I take out each card and try one by one to see if any one them are causing a problem nope.As a side note the computer light comes on, but if I like the power button it just shuts right off. Also the computer power up when I put the plug in the back without pressing the on button.
today i took the computer apart to see if I could find any blown caps... hmm nope. Went to the local computer store but they don't test for anything mac so he said I could try out their power tester nothing would light up on the tester but it may have been wrong pins. CD drive showed all voltages but 3.3v.Now im not sure if it's the MOBO or the Power supply is there any way to test this out? or if I toast something else? I have no clue.
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Dec 20, 2007
I am interested in adding a webcam to my desktop Imac (power pc)- Isight is no longer available- an option that I found is the Ecamm Image- but apparently it is USB and not firewire and it will only run with high speed usb- how do I know which type is on my computer? I checked system profiler but quite frankly wasn't sure of the designations.. does anyone have any experience with this camera, by the way? is USB 2.0 by definition "High Speed"?
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Jun 16, 2009
Does it hurt the computer... If the computer is doing something (watching flash, playing a game) that turns on the fan full speed;Does this hurt the computer? There are a few games I like to play and they turn on the fan at full speed (computer gets hot too, on the bottom.)
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Jul 31, 2009
For the last couple of days my fans have been going crazy, spinning at 6200RPM non stop. I installed fan control last month but the issues just started. When I open up fan control it says my fan should be spinning at 4000RPM. I had smcFanControl installed before and its still installed. My bluetooth module over heated yesterday so I used SMC to rev up the fans. I don't know if that is the issue because it isn't running now. I'll try uninstalling that now.
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Mar 17, 2009
Quite a while back, I switched from Firefox back to Safari, because Firefox was driving me crazy with it's intermittent freezes and whatnot. Safari was so much faster and allowed tabbing to menu form fields (which I think Firefox still does not do). But lately, it seems like Safari just slogs through everything it tries to do. Google maps is painful. Loading up the CBS website earlier took over a minute, and not because of a slow connection.
The spinning beachball now appears on every click it seems. This is was Safari 3, so I updated to Safari 4 beta, and it doesn't seem much better. It's odd because it didn't used to be like this...It just sort of started out of nowhere. One thing I do notice is that my hard drive is just churning away with activity at these times. Any ideas what could cause such random slowdowns? Restarting does not help. It's just as slow afterward.
MacBook Pro 17" 2.0 Ghz, 2GB Ram, 160GB HD
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Feb 4, 2009
My parents have an older 20-inch white Intel iMac that has run great through the years. But about a week ago it just started spinning the CPU fans up to 3500-4000 RPMs and it won't bring them back down. Istat shows that the CPU temp is around 90 degrees and the computer remains cool to the touch.
So it isn't overheating. My parents keep it off most of the time because they don't want to ruin it, but they're planning on using it in their business they're trying to start up. We've done some web searches and nothing seems to fix it.
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Dec 7, 2007
Every so often my Mac Mini 1.83 Core Duo w/Super Drive will experience a random increase in fan speed...the fan speed increases from 1500rpm to over 5000rpm for a couple minutes, and then will slowly return to normal.During these fan speed-bursts there is no increase/abnormal temperatures. CPU and Ambient temps could be at 40C. System load is also minimal (95% idle, eg).Haven't heard of this as a common problem, but is this fan behavior indicative of any type of problem?
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Nov 4, 2010
I recently was given an old 2x1.8Ghz PPC G5 in order to build a personnal server but I have troubleshooting with CPU's temps that are really too hot (75?C with no app open, only Finder).
I know these temps are not that "hot" but I can't imagine what it would be when I'll open Safari, iGetter, iTunes, CyberDuck, Adium and Photoshop CS4...).
I first unmount everything, blown inside some bottled air to make sure there were no dust creating overheating inside and remount everything.
Installed Leopard (last OS installable on PPC machines), made the last updates possible and restart.
Everything is working well althought this CPU's temp is so damn high and fans's speed are still at 300rpm. I was looking for some app that would do the same as SmcFanControl for Intel based Macs but for PPC's ones.
After many internet searches on many forums I finally admitted there were no software able to set fans's speed, the only way was manually editing the AppleFan.kext integer's values.
WhatI did, reducing the integer values to lower rates (256x multiples), then restarted the Mac but nothing happens. As I check the changed values, they indeed are the ones I edited but the fans still are at 300 rpm and the CPU's temp 75?C...
Does somebody have any solution for that issue, I feel I checked everything that was possible but nothing seems to work.
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Sep 9, 2008
In the last week or so i have been experiencing lock ups every 15-20 minutes, which last for around a minute. The problem has only presented itself after I moved to a dual monitor configuration, although this may be coincidental, given the nature of the problem. The problem only seems to occur when the system is reading from from the main hard disk however testing the disk (and performing a directory/file test) says that the disk (and all others in the system) are functioning properly.
Curiously, any audio playing at the time, regardless of the application it originates from, continues to play while the rest of the system is unresponsive. It also appears as if the keyboard and mouse are disconnected during this time, and the power lights on each begin to flash, and the Caps lock key no longer lights up. I would like to avoid replacing the system disk if at all possible, as i have already had to do this three times since last December, when i purchased the system, due to drives developing faults.
2x Dual-Core Xeon 2GHz
1GB RAM
NVidia GeForce 8800 GT
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Feb 8, 2010
The issue I'm having is very weird taking into consideration that I just upgraded my hardware two months ago. I have an Intel X-25M SSD as my boot drive for OSX and a 1.5TB WD HDD with my Home Folder on it. Whenever, I launch an app it never launches immediately. I get a beachball that lasts about 5 seconds. When I try shutting down the computer I have to hit shutdown about 3-4 times before it does. Otherwise, it warns me with a message thats something like this: System cannot logout of user account because Safari is still in use. (but it's closed). Launching an app from an ssd should be instantaneous. So I don't understand if it is a hardware or software issue. I reset the PRAM ... helped for about a day but I'm back to the slowdowns. Any ideas. Also when I performed a software update for iTunes, the update installed but I got this warning so I have a feeling something is wrong.
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