PowerPC :: IMac G5 Overheating - Fan Starts Spinning Loudly
Apr 3, 2010
I have an iMac G5 that is starting up, then working okay for 1-2 minutes. After that, the processor usage goes way up, and the fans start spinning loudly. It's a first generation 1.8 GHz with a 17" display. Mac OS X Leopard. Recently, it spun up and then shut down and wouldn't start again. The room it's in is < 75 degrees F. No malodor, or other symptoms save for hot to the touch. Has been left shut off and unplugged for a few hours, and still has this problem.
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Aug 22, 2014
Mac won't boot, starts with white apple screen and spinning wheel. Also has grey loading bar which disappears after loaded then stays at white apple screen.
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Dec 31, 2010
I don't know if it is a fan or a drive that starts up and runs really fast and loud, then the computer shuts off. I always thought it was the fan, but now am not sure. I have moved it to a place where it is exposed to more air, but that has not seemed to help. Does anyone have an idea or solution to this problem? The nearest Mac dealer is about 80 miles away, so if I can fix this on my own, I would like to try.
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Aug 9, 2007
Yesterday a friend gave me a really nice 17" iMac G4 he was planning to throw out because it was having problems. I would really like to get this working and would potentially be willing to buy parts to repair it. I have a significant amount of Apple hardware experience, but would like to get the opinions of people who may be more familiar with iMacs than myself on these forums. The problem is that the computer has random kernel panics. Sometimes it occurs as soon as the computer is turned on, sometimes after it has been on for a few minutes, sometimes after a few hours. So far, I have replaced the RAM with known good sticks, have replaced the hard drive with a tested good one from my collection (and these were both upgrades to boot!) and I have re-applied thermal paste (Arctic Silver) to all key components (CPU, ends of heatpipe, GPU) but to no avail, I still have the same problem.
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May 3, 2012
When I have documents open and I walk away for a few minutes, when I come back and resume working, my computer freezes up and the little pinwheel starts spinning. I literally have to unplug it to get out of this frozen state. This has been getting progressively worse over the past three months. They told me to add more memory, which I did. However, the problem persists. Do you know why my computer would freeze up after the screen has had no activity for just a few minutes? My screen saver is set for an hour so I know this is not the problem.
Info:
iMac, Mac OS X (10.4.11)
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Jun 5, 2014
all of my devices are recognized by itunes and it starts as normal. after a few seconds the cursor starts spinning and nothing else happens. i have to force quit to exit itunes.
Info:
OS X Mavericks (10.9.3)
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Jan 17, 2010
I have been battling with fan speed on my iMac recently.
I installed iStat which shows normal temps, but the fan revs up to 4000rpm - for seemingly no reason at all. Sometimes its quiet for long periods. It sometimes helps for a while if I put the machine into Sleep mode, but then I hear the fan start to rev up again when I resume activity.
I have spent hours with tech support, who then upgraded me to a higher level of tech support. But still the problem continues.
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Sep 6, 2007
After having inserted a dvd borrowed from the library which my Imac had a really tough time reading, I turned off my Imac as usual. Since then when I turn my mac on the fan starts roaring and i don't get beyond the first white screen with the sort of clocked wheel just going round and round. I don't have a clue to what to do.
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Nov 27, 2010
I've got an early 2005 model Power Mac G5. Bought it from a hospital and it's really clean inside. Lately it's been shutting down spontaneously without warning. I thought it might be an issue with overheating, but I'm not that familiar with normal heat levels for a CPU. I installed iStat nano and checked the temperatures. I took a screen shot of the widget. Temperatures are in Fahrenheit. Can anyone tell me if I'm on the right track? What do I need to do to solve this problem?
Power Mac G5 (early 2005)
PowerPC G5
Dual 2.3GHz
2 GB DDR SDRAM
Model Number:A1047
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Oct 14, 2008
I have a G5 2.7ghz powermac. Recently it began switching itself off at start up. If it did boot up - it would only last for a few minutes that it would freeze.
I clean out the dust from the inside and even took the cpu cover off - none of it has made any difference. I have also replaced the lithium battery. Has anybody else experience this?
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Oct 1, 2009
I have a new macbook, see stats below.
Up till last week everything was fine, I could run 'Second Life', photoshop, email, a browser, download stuff, play Itunes AND watch a movie all at once without any trouble.
But recently the computer has gone a bit weird.
It started getting very hot, much slower and turning itself off.
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Jul 19, 2009
I just bought a brand new imac running 10.5.7 3.06 Intel Core 2 Duo 4 GB 1067 MHz DDR3 i downloaded Handbreak to rip some of my dvd's and put them on my external hard drive as soon as i open handbreak and start ripping a dvd, the fans in my computer start whirring away, pretty loudly i downloaded the istatnano widget to check my fan rpm's and temps
While Running Handbreak:
Fans:
CPU Drive - 3605 rpm
Hard Drive - 2408 rpm
Optical Drive - 2195 rpm
Temps:
HD - 57
CPU A -46
CPU A - 80
GPU - 53
GPU Diode - 48
GPU Heatsink - 47
Ambient - 27
is this ok? is there something wrong? the fans are just so loud
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Jun 24, 2009
iMac is been in on the repair bench more times than I can count. Luckily, most of it was under warranty. But I was just wondering, if anyone here's got the same system (or knows someone that does) and has 'modded' it to run cooler?
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Aug 25, 2010
I recently got my 3.2ghz mid 2010 21.5' imac. I noticed that its been getting really really hot on the top on the top left and right corners of the computer. Usually i am watching tv series (.avi) files on it using quicktime and vlc and i checked the temps reaching these as follows
HD 54
CPU A 50
GPU diode 71
GPU heat sink 68
memory 58
optical 51
and the fans are at
CPU fan 1470 rpm
HD 1099
optical 1000
are these temps okay? or is htemachine over heating for the activities i am doing, usually i amjust msning, and watching tv series.
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Dec 25, 2010
I got an iMac i5 recently, and I've downloaded iStat. It seems as though the HD hovers around 55C, and I think 60C is the maximum. Are there any precautions I should take, or is there nothing to worry about?
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Aug 21, 2009
My Imac freezes up a lot, usually after 10 to 15 minutes of being on. I suspect it has something to do with overheating. I have to get my data off of the drive before I take it into the Apple store for fear that they will will just replace the drive and all will be lost. I have a fan blowing on it now in the back and am copying data onto an external drive little by little until it freezes up.
I bought it last fall and have a 3 year warranty on it and this will be my second time bringing it in for repair. The first time it was a problem right out of the box when I brought it home and it was replaced. It's a 3.06 processor, 24 inch screen. I am not impressed by the hardware reliability and the all in one system. I am regretting buying the imac after being a PC user for so long and I am using my Windows PC to write this. I suspect the cooling system could be better on my IMAC given the compressed footprint.
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Sep 14, 2009
I've been having trouble with my new iMac that i purchased recently (26th of August actually). Whenever I'm doing something CPU intensive, the machine just shuts off, but usually it's not right in the middle of whatever I'm doing, it's after I close the application. For example: I was playing SimCity4 the other day, pretty old game to cause this problem I would think. As soon as I exit the game, the system shuts off. No warning, nothing, just shuts off. This will happen when i close VMs (it actually happened yesterday while I was running the VM), etc. So I've reset the SMC/PMU, PRAM/NVRAM, and I've even reseated the RAM. Still the same problem. I've taken it in to a repair center in town, hoping I'll get it back by the end of the week. Does anyone have any idea why this would be happening?
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Sep 13, 2008
I was using my Imac G5 (pre iSight) and it suddenly shut down. It smelled of burnt plastic so I immediately disconnected the power and all accessories, laid the computer down, and took off the cover. Everything seemed normal, except the smell of burnt plastic coming from the fan and faintly from the power supply. I took the metal piece covering the fan and hard drive, and attempted to clean the fan. After about an hour I put the cover back on, plugged my computer back in, and started it up. It again shut down after about half an hour of use. What's wrong? Do I need a new power supply? I checked the Apple Recall and my serial fits, but the symptoms do not follow the ones in the recall.
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Mar 30, 2012
I have brought a new iMac 27'' the i5 model. I have noticed that the fans never change speed no matter how hot my processor gets ? Is this normal ? I have ran prime 95 and istat pro to check the temps and fan speeds. Nothing changes apart from the temperature.
Info:
iMac, Mac OS X (10.7.3)
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Jul 16, 2008
I got a Powerbook 190 from my grandfather. He didn't give me the cord to plug it in with. He gave me the cord that has the big box, that connects to the computer. It was missing the cord that goes from the box to the wall. I read that it said to ONLY use an apple cord.My step dad said "that's not how electricity works." and gave me a regular, random computer cord. I was unsure, but plugged him in anyway.
He worked perfectly for one night. No problem at all. Booted up right away. I played on him for a few hours. It was time to go to bed.
He hasn't woken up since. He's made the start up sound a few times, but never starts up. I've pushed the reset button on the back a thousand times. At least what I THINK is the reset button. They just say under the video out port, but I don't know what that looks like. What I'm pressing is a small, very flat, wide (but still very small) rectangle of a button. Nothing. I've held it down for 40 seconds, 4 or 5 times. I've taken the battery out, and then held the reset button. Nothing. I've tried everything I know to do, for about a month now.
I left him alone for a few weeks. I plugged him in today, and it made the start up sound, and then nothing.
Can I save him? How? Should I try an apple-specific computer cord? Do I need a new battery? If I did, wouldn't it start up with the battery out, but still plugged into the wall? Fried motherboard?
I even found a freaking airport card that'll work with it, and an external floppy disk for my new mac, so I can transfer files from one to the other. I was so excited about him. And my dreams were crushed.
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Feb 25, 2009
Ive had my Imac for about 9 months and havnt had any issues with it until the past 2 months. The first issue was that i would leave it running for the day and i would restart and get the flashing folder issue. I would then go through all the appropriate steps- unplugging from the power source for 45 seconds +, try booting it with the OSX cd in, ect. At first these steps worked. The next issue i had was a power outage. I followed the same procedure when i went to start my imac up again (mind you it was within 10-15 minutes of it being turned off) and these steps did nothing and the flashing question marked folder appeared every time. I called Apple support and after 2 hours they insisted that it was a faulty hard drive. I let the imac sit for the rest of the day and before i went to bed i decided to give it one more shot. It booted up just fine.
Ive come to the conclusion that im only getting the boot error when it has been running for long periods of time and that the casing feels hot when i try restart. I was wondering if you guys could let me know if my theory of over heating causing the boot error is correct, and if so is there anything i can do myself to help correct the problem? I really want to avoid going to a mac store because its so far away from my location.
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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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Sep 16, 2010
Here is my setup..
The BSNL modem's LAN 1 is connected to the iMac.
It all works fine.
But as soon as I switch on any of the windows PC on the both sides, the modem gets crazy and the whole line gets unstable.
Like the internet starts going on and off continuously.
I dont understand, what is the reason.
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Apr 23, 2012
I have an old g4 , the kind shaped like half a golf ball, which starts up and then quits at different places during the process. Sometimes with the gray screen and Apple logo, sometime later when the OS has fully installed,but fails quite rapidly after that. Then tries to reboot itself with varying degrees of failure.
Info:
mac g4, Mac OS X (10.4.9)
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May 2, 2012
I only got the computer yesterday from Apple, but it was refurbished. It's an iMac 21" 2.7 1TB.
Info:
iMac, Mac OS X (10.7.2)
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Jul 21, 2009
Over the last few weeks when I have been starting my computer up I get the white blank screen for a few mins then it goes to a flashing globe for a few more mins then the apple sign then it finally starts. I have been thinking about taking my computer in to get it fixed cause I cant seem to figure out whats wrong with it. I have looked it up on google and everyone seems to be saying to go to startup disk and then pick the right network volume to start up from, but when I go there there is only one choice its called "Network Startup" and there is a globe with a ? on it for the symbol. Also I read a couple places that its the hard drive warning me that its crashing? is this true? I also have had a couple freezes the last couple days.
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Jan 9, 2009
In the last three days my iMac desktop has begun starting itself up. There is an audible beeping (three or four beeps) and the on/off indicator light blinks rapidly. When the screen comes up there is no desktop but a gray background with reboot instructions. When I type the reboot words "mac-reboot" the desktop comes back.
Under Logs in the system profiler I see the following message:
CGXDDisableUpdate:Updates disabled by connection 0x66-3 for over 1.000000 seconds
and
CGXBlindSurface returns-536870210
The computer is rather old, is running OS X 10.2.8 and has never done anything like this before.
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Feb 4, 2012
I have a 2009 iMac with SSD drive and 2TB drive.For the last 6 months, I'd get kernel errors every now and again, and I would reboot and things would be fine. A few days ago, the computer totally froze, and when I turned it on, it would shut right off. I tried booting to recovery partition, nothing worked. I took it to the apple store yesterday and they hooked it up to an external drive and then did a diagnostic test and the genius said it needed a fresh install of lion, that something was corrupting it. So we did that (for some reason though, it took about 4 tries for him to get it), and then I took the computer home and ran time machine.
Every thing worked as it should for about 12 hours, I did reboot a few times in that time. Anyways, now, it's back to where it was where I turn it on, there's a status bar on the bottom that fills about halfway and then the iMac shuts down. The apple genius said that a corrupt program/application might be causing that. I find this hard to believe ... I can understand a corrupt program crashing or not starting, but is it possible for that to not allow the computer to even turn on? The other thing is that when the computer crashed a few days ago, I hadn't installed anything new/etc .... ???
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Oct 22, 2006
For the first time ever, my Titanium Powerbook won't load OSX. I was using Excel when the beach ball started spinning. I've had that happen, so I just went to force quit. It wouldn't force quit for me. So I let it sit a while and tried again. Again, it wouldn't force quit. So I tried to Restart the Mac. It restarted, but when it did, I don't see the OSX load screen. I get a blue screen with the spinning lines, but that's it.
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Sep 9, 2009
my problem: IBook G4 that recently on reboot is just sitting on the grey screen with the spinning icon as seen here:
what i have done: basically followed apple's tips here
1- booted into safe mode; no change
2- booted into safe mode with shift-command-v to watch the boot; and it just loops around and around; no change
3- reset the nvram/pram; no change
4- booted into single-user mode; ran "fsck -fy" and returned with no errors and "...OK" and rebooted; no change
5- would move on to using my boot disc, however, here is the difficulty- my cd player gave out a bit ago and never replaced it.
so any suggestions? put in a new cd drive? would it recognize it? bring it into the store? i have searched around and haven't seen what to do in my kind of case.
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