IMac PPC :: G5 Keeps Shutting Down
Jul 1, 2012
Recently a email link was clicked on and since then my wife has been having issues with her G5 shutting down. Sometimes the box will not completely boot at all and others it will boot up for a moment and then shut itself off.
I have looked for teh Flashback Trojan and appear to be clean. If i boot the box in safe mode when booted in safe mode all seems okay. I have also recently reset the PRAM and have had the machine up for a few minutes and it has not shut down yet.
Info:iMac, Mac OS X (10.5.8)
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Apr 1, 2007
I have a iMac G5 (Pre-iSight). I just got home and my computer was off, I didn't turn it off and I asked my mom, she said she didn't come into my room. I was posting something on here and my computer shut off on its own. What gives?
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Feb 2, 2009
I have a refurbished iMac G5 that randomly just shuts off. It makes a little "zzzttt" sound, like something is short circuiting and then dies. Sometimes I can power it right back on and sometimes I have to unplug it and wait a few hours before it will come back on. While it's running, there are no issues. It functions beautifully. Anyone else had this type of problem or can you suggest a solution? Here's the info on it:
Mac OSX 10.4.1,
Machine Name:iMac G5
Machine Model:PowerMac8,1
CPU Type:PowerPC G5 (3.0)
Number Of CPUs:1
CPU Speed:1.8 GHz
L2 Cache (per CPU):512 KB
Memory:1 GB
Bus Speed:600 MHz
Boot ROM Version:5.2.2f4
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Feb 4, 2009
I've learned quite a bit from this site in recent weeks as I found it following my purchase of a 20" iMac (2.66 GHz) a month ago. I've got a question for the group and I'm quite certain it's a stupid one so please be gentle. As I do every night, last night I put my iMac to sleep at around 11:15 pm before going to bed. Upon awaking this morning I couldn't get it to wake up. Hitting keys on the keyboard didn't do it, nor did moving the mouse around. I'm not sure if this is important but both my keyboard and mouse are wireless. Power to the other things on my desk was still on so it wasn't a power problem.
Anyway, I hit the power button on the back to see if it had simply shut itself off and nothing happened. I hit it again. still nothing. Finally, hitting it a third time did the trick and the computer roared to life and came on normally. It had never done this before. It had always immediately awakened in the morning upon hitting a button on the keyboard. First, is this common for an iMac to shut itself down? Second, why would the power button be unresponsive? Finally, if the machine had actually not been off (which I doubt very seriously) did I do a big "no no" by hitting the power button to turn it off/on?
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Mar 23, 2010
I have a MacBook which has recently been shutting down when it feels like :/ this all started a week or two ago (well not the shut downs but other issues that I'll get too), basically the fan I think has been knocked as it is bumping the top or something as the whirring is getting loud and it sounds like every now and again it hits something
Also CPU usage seems to be averaging out at 20% for Safari and 100% for HD Video where as it used to be very small amount for Safari and 30 - 40% for HD.
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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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Sep 2, 2007
a close friend has a 20' iMac g5. the Computer now shuts downs sporadically and she says it gets a lot hotter any idea what's wrong?
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Mar 30, 2012
My G5 Power PC imac shuts down on it's own.
Info:
iMac (27-inch Mid 2010), Mac OS X (10.5.8)
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Apr 23, 2012
My IMAC with Lion desktop is randomly shutting off.
Info:
iMac, Mac OS X (10.7.3), Lion
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Dec 6, 2014
I have a late-2009 27" iMac i7 with 8gb Ram and a 1TB HD. I updated my OS to Yosemite soon after it came out. Now, I admit I don't use the computer that often, so it took a while to notice the issues but, we first realized there was a problem in early November when my husband could not download a game (presumably because of the wi-if connectivity issues supposedly fixed in the latest update). It was around a week after he finally was able to download tthe game, that he was playing it and the computer would just shut down out of nowhere. No warning, just shut down and restart with the "your computer shut down unexpectedly" screen.
Now, because it happened so many times, I started to get worried about all of my photos and music that is stored on thIs computer, so I went to do a back-up on my time capsule. This was when I noticed my computer had at some point been renamed (not by any human) to "my Computer (3)" when prior to yosemite (as far as I can tell) it was named "my computer". Also at this point I could not for the life of me get the time capsule to back up the computer as it was looking for "my computer" and all that was available was "my computer (3)". This is when it had been working flawlessly for years. I ultimately had to wipe the TC completely, reformat it and start a back up from scratch. It was for the short period of time that the time capsule was not connected to the computer that we noticed it was no longer shutting down unexpectedly. however, one the TC was reconnected and doing a back up, anything extra that you would be doing (with the exception of web surfing) caused the computer to crash.
So, simple fix, right? Turn off the auto back ups while and try to remember to turn them on every so often. fine , dandy, whatever. However, I have done the latest yosemite update and the wi-if still does not seem to be staying connected, disconnecting every few minutes. Now I'm seemingly having more issues with a game that is well within the limits for my computer and the game will not start.
Info:
iMac (27-inch Late 2009), OS X Mountain Lion (10.8.3)
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Dec 4, 2014
Recently my 27" iMac keeps shutting down after 15 or 20 min use. It's very irritating and it's take awhile to restart again. Â
Info:
iMac, iOS 8.1.1
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Dec 16, 2009
I don't know if this has been discussed here but all of a sudden my iMac, running Snow Leopard, 10.6.1) keeps waking up all on it's own. I believe this started after the latest update of Java and Super drive firmware (I believe these were the latest updates).
Is there anything I can do short of shutting the computer down.
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Sep 9, 2010
I can't figure this out. My iMackeeps shutting itself down part way through the Windows 7 Boot Camp install. I can't get it completed. Usually about at the point were files are copied it turns off.
Is it possible the fans are not working properly while booted to a CD causing it to overheat and shut down?
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Sep 21, 2007
My friends iMac G5 just recently has been randomly shutting down. Does anyone know anything I can do to him fix his computer?
I checked [URL] and there seems to be issues with power on some models, but his serial number just misses the infected batch.
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Feb 5, 2008
I looked into my issue a little but recently my IMac G5 started randomly shutting down when left unused for a bit but that seems to have stopped as far as I have noted. Now occasionally when it goes into sleep mode it will freeze on the black screen and the fan will go crazy. I plan on buying a MBP, if the update ever comes out, and then ill just completely wipe the IMac and give it to my parents, who still use the original I mac, G3 or something. I read a certain series of I Macs were having motherboard problems, W950 or something, but mine wasn't that serial code.
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Mar 29, 2009
I use "Ctrl+Shift+Eject" to shut off my iMac screen (not shutdown) usually before I go to sleep, but recently, I've had to hit it 5 or 6 times before it actually turns off the screen. It also happens when putting the computer to sleep pressing "Option+Command+Eject".
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Aug 30, 2014
I have had this for the last few days, so I don't really know what's going on...Â
Anonymous UUID:Â Â Â Â Â Â D4B5793A-92CF-4E5D-33F8-94D77B084C5CÂ Â
Sun Aug 31 00:07:39 2014
panic(cpu 2 caller 0xffffff8002c5220d): "zalloc: zone map exhausted while allocating from zone kalloc.8192, likely due to memory leak in zone kalloc.64 (1440851328 total bytes, 22513266 elements allocated)"@/SourceCache/xnu/xnu-2422.100.13/osfmk/kern/zalloc.c:2494
Backtrace (CPU 2), Frame : Return Address
0xffffff81348c3c70 : 0xffffff8002c22fa9
[Code].....
Info:
iMac, OS X Mavericks (10.9.3)
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Dec 16, 2010
I have an iMac7.1 with Intel Core Duo, 2.8 GHz, 4GB Memory. I'ts crashing occasionally without any related program start or running, or at least I never found out any relation between software or operating system. I had these with the old tiger 10.4 system and it's continuing with Snow Leopard 10.6 - This is what happens: Just in the middle of my normal work (sometimes I don't even do anything at all), I recognize that the harddrive stops spinning (I can tell from recognizing that the low humming noise from the drive just goes away). After that, I can click on active window, but see the spinning beach ball. No matter how long I wait, this is not changing so that I have to turn off the iMac by holding the power key for a few seconds.
After reboot, all works fine. Yesterday I had another crash just a few minutes after reboot. But in most cases it works fine for another day or two until it crashes again. I already ran DiskUtility (no harddisk errors found) and tech tool deluxe without finding any problem. In old Tiger 10.4 I needed to run a disk repair after each crash (obviously due to shutting down the system using the power switch), since Snow Leopard I never had to use disk repair after reboot. Maybe anybody can give me a hint if there is something I can do about that. Apple care don't help me much, because I don't have an apple store nearby and I don't own a car to bring the machine in.
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Mar 30, 2009
I'm a first time iMac and skype user. I downloaded skype 2.7 earlier today and managed to do a video call for 30 minutes without any problems. However, after trying to use it again 3 hours later, my iMac keeps shutting down everytime I make a video call. None of my video calls last more than a minute before my computer shuts down. I tried reinstalling skype from scratch again but t didn't work. Even the beta version failed to solve the problem. I'm new to both iMac and skype.
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Apr 16, 2012
Safari keeps shutting down, and when the error message pops up, it says .StakeLCLpht.so plugin shut down. What can I do?
Info:
iMac, Mac OS X (10.6.8)
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Feb 27, 2010
Recently got a week 8 x4 i7 27" iMac. When running Windows 7 x64, sometimes randomly the screen will fill with pink squares and just freeze and shutdown. It looks like a graphics problem but I could be wrong.
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Aug 26, 2014
My 2007 iMac keeps shutting off randomly. I'm running Mountain Lion. I have tried unplugging it from the back waiting and plugging it back in. Sometimes when I have turned it back on, the fan will run loudly.
2GHz Intel Core 2 Duo
4GB Ram
OS X 10.8.5
Info:
iMac, Mac OS X (10.5.1)
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Jul 2, 2009
all of a sudden today my computer shuts off. It's when I leave, I come back and it's off. I have no idea what is wrong and NO clue how to trouble shoot this!
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Sep 11, 2009
i stupidly got my mac mini wet. water ran underneath it. now it seems that every time the mac heats up too much it shuts down. how can i fix this?
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Aug 25, 2009
I have a fairly new Mac about 1.5 years old. Recently I am having an issue with it shutting down periodicly for no apparent reason and then it starts back up> I have noticed it does do this by bumping the desk or hitting the screen but it is only every so often and can't duplicate it by trying these things.
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Aug 30, 2010
I use Daylite and Daylite Server on my MBP connected to the net and sync my iPad running Daylite Touch through my 3G connection. It works great while I have my MBP running. I want to set up my MBP so that it will run without shutting down (screen blanked out). I just want to do this for a few days to see how it works out. If I like it I will get a Mac Mini to run as the server instead of the MBP.
The problem I am having is that no matter how I adjust the settings on the MBP, after awhile it shuts down Daylite and Daylite Server. Daylite Server shuts down and puts out an error message and everything just hangs there. I figure I must be doing something wrong in the settings but don't know what. I tried searching the forums, google, apple support, etc. but haven't found anything - of course I am probably searching all those wrong too.
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Dec 23, 2008
About 10-15mins after starting a WoW session in 10.5.6 on a Mac Pro, the screen goes into powersave mode, and cannot be returned. This is leaving me with no alternative but to hard reboot!
I can hear the fans going mad as I'm playing, so wonder if it's a heat issue. If so, what to do about it?
Can anyone suggest:
a) How to break out of screen power save without hard rebooting?
b) What the issue may be and how to investigate/resolve it?
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Feb 13, 2009
My mac os x 10.5.6, (2.8 Ghz Intel Core Duo, 2GB 800MHz DDR2 SDRAM) keeps shutting itself down spontaneously - no error message occurs before or after it shuts down, and when i press the power button on my mac i get no response.
I have to turn it off at the power point and turn it on again.
I have a power surge board and only my mac is plugged into it so i'm pretty sure it's not a surge problem.
It seems to mainly happen when the screen saver comes on, and i have checked all of my system preferences and i havn't selected to turn off hard disk's at any time etc. I have no idea why it's doing any of this!
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Mar 5, 2012
When im playing a game in bootcamp, my computer just randomly turns off. I thought it might be from overheating, but I started using a cooling pad to try and help, and it shut down almost right away the next time I went to play. It happens occasionally when im running osx, but not nearly as often.
Info:MacBookPro, Mac OS X (10.6.7)
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Apr 9, 2012
After I bought it, I noticed that the fan was making loud noises when I used it too long. I know it is normal for it to overheat after a long period of use but it doesn't just overheat, the fan starts making a weird grinding noise. I thought that it was just dirty and it wasn't affecting the way my computer was running, so I just ignored it.
It has been almost a year now since I first bought it used and the fan has gotten a lot quieter, but just starting last week I was watching a movie on Netflix and right in the middle of my movie, the computer just randomly shut off. I figured it was overheating. But, even after it had cooled down, I went back to watching my movie and within 10-15 minutes, it did it again!
Info:MacBook, Mac OS X (10.5.8)
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