IMac G5 shuts off by himself

hello everybody,
I have an iMAC G5 20' and I just update the system with Tiger X.4.7 a week ago and since then my iMac is shutting off abruptely by himself without any warnings. It happens two times last week and tonight it happens twice.
The overall temperature of the Mac seems correct
Anyone has any idea ? I already saw that some MAc Book users seems to have the same problem !
Any comments ? Thanks for your help
Jipes

Hi, Jipes.
Could be a power supply problem or an issue with mains power: assure the power cord is connected properly to the computer and mains power, and that the power cord is undamaged. Try a different power socket. If you use a UPS, be sure the battery is good.
As far as general iMac G5 troubleshooting goes:
1. See if your computer's serial number is in the range specified in the "iMac G5 Repair Extension Program for Video and Power Issues" document.
2. Rule out potential hardware problems. Run the Apple Hardware Test that came with the computer. Instructions for doing so will be found in the hardcopy manual that accompanied your computer. For additional details, see my "Apple Hardware Test" FAQ.
3. Check the diagnostic LEDs, a feature of your iMac G5. See "About the iMac G5 diagnostic LEDs."
4. If your iMac G5 will not turn on, see "iMac G5: Troubleshooting when your computer won't turn on."
5. See also the iMac Service & Support site.
6. Check the iMac G5 Discussions for similar reports from other users.
7. As a general check, run the procedure specified in my "Resolving Disk, Permission, and Cache Corruption" FAQ. Perform the steps therein in the order specified.
8. If the computer is either under warranty or covered by an AppleCare Protection Plan, don't hesitate to take advantage of your warranty and contact AppleCare.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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    5/23/11 9:42:53 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:42:53 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:42:53 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:42:53 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
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    5/23/11 9:43:07 AM          [0x0-0x34034].com.google.Chrome[258]          Mon May 23 09:43:07 Kyle-Sampsons-iMac.local Google Chrome Helper[285] <Error>: unknown error code: invalid context
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    Last login: Tue May 24 08:58:47 on console
    Kyle-Sampsons-iMac:~ sampson2269$ last
    sampson2269  ttys000                   Tue May 24 11:13   still logged in
    sampson2269  console                   Tue May 24 08:58   still logged in
    apesfrep  console                   Mon May 23 19:35   still logged in
    reboot    ~                         Mon May 23 19:34
    apesfrep  console                   Mon May 23 08:46 - crash  (10:48)
    sampson2269  console                   Mon May 23 08:41 - crash  (10:52)
    reboot    ~                         Mon May 23 08:41
    sampson2269  console                   Sun May 22 00:17 - crash (1+08:23)
    reboot    ~                         Sun May 22 00:17
    shutdown  ~                         Sun May 22 00:16
    sampson2269  console                   Sun May 22 00:05 - 00:16  (00:10)
    reboot    ~                         Sun May 22 00:05
    sampson2269  console                   Sun May 22 00:03 - crash  (00:01)
    reboot    ~                         Sun May 22 00:02
    sampson2269  console                   Sun May 22 00:01 - crash  (00:01)
    apesfrep  console                   Sat May 21 20:04 - crash  (03:58)
    reboot    ~                         Sat May 21 20:02
    sampson2269  console                   Sat May 21 16:41 - crash  (03:21)
    reboot    ~                         Sat May 21 16:40
    apesfrep  console                   Sat May 21 10:33 - crash  (06:07)
    sampson2269  console                   Fri May 20 13:35 - crash (1+03:05)
    reboot    ~                         Fri May 20 13:34
    sampson2269  console                   Fri May 20 12:07 - crash  (01:27)
    reboot    ~                         Fri May 20 12:06
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    reboot    ~                         Thu May 19 22:42
    sampson2269  console                   Wed May 18 05:00 - crash (1+17:41)
    reboot    ~                         Wed May 18 05:00
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    sampson2269  console                   Tue May 17 22:51 - 23:07  (00:16)
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    reboot    ~                         Fri May 13 16:36
    sampson2269  console                   Thu May 12 02:22 - crash (1+14:14)
    apesfrep  console                   Thu May 12 02:21 - crash (1+14:15)
    reboot    ~                         Thu May 12 02:20
    shutdown  ~                         Thu May 12 02:19
    apesfrep  console                   Tue May 10 19:09 - shutdown (1+07:09)
    sampson2269  console                   Tue May 10 18:31 - 02:19 (1+07:48)
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    reboot    ~                         Sat Apr 23 15:30
    apesfrep  console                   Thu Apr 21 18:42 - crash (1+20:47)
    sampson2269  console                   Thu Apr 21 12:55 - crash (2+02:34)
    reboot    ~                         Thu Apr 21 12:55
    shutdown  ~                         Thu Apr 21 01:21
    apesfrep  console                   Mon Apr 18 16:02 - shutdown (2+09:19)
    sampson2269  console                   Mon Apr 18 09:47 - 01:21 (2+15:34)
    reboot    ~                         Mon Apr 18 09:46
    shutdown  ~                         Mon Apr 18 01:47
    sampson2269  console                   Sat Apr 16 12:47 - 01:47 (1+12:59)
    reboot    ~                         Fri Apr 15 16:09
    reboot    ~                         Fri Apr 15 16:08
    root      console                   Fri Apr 15 16:08 - crash  (00:00)
    sampson2269  console                   Thu Apr 14 20:43 - 16:08  (19:24)
    reboot    ~                         Thu Apr 14 20:42
    sampson2269  console                   Mon Apr 11 15:31 - crash (3+05:11)
    reboot    ~                         Mon Apr 11 15:29
    apesfrep  console                   Sun Apr 10 16:55 - crash  (22:34)
    sampson2269  console                   Sun Apr 10 16:39 - crash  (22:49)
    reboot    ~                         Sun Apr 10 14:52
    sampson2269  console                   Sun Apr 10 09:48 - crash  (05:03)
    reboot    ~                         Sun Apr 10 09:48
    shutdown  ~                         Sun Apr 10 01:14
    sampson2269  console                   Sat Apr  9 09:04 - 01:14  (16:10)
    reboot    ~                         Sat Apr  9 08:52
    sampson2269  console                   Fri Apr  8 14:38 - crash  (18:13)
    reboot    ~                         Fri Apr  8 13:20
    reboot    ~                         Fri Apr  8 13:20
    root      console                   Fri Apr  8 13:17 - crash  (00:02)
    sampson2269  console                   Wed Apr  6 12:42 - 13:17 (2+00:35)
    reboot    ~                         Wed Apr  6 12:41
    sampson2269  console                   Wed Apr  6 00:22 - crash  (12:19)
    reboot    ~                         Wed Apr  6 00:21
    sampson2269  console                   Sun Apr  3 18:50 - crash (2+05:31)
    reboot    ~                         Sun Apr  3 18:49
    sampson2269  console                   Sun Apr  3 11:04 - crash  (07:45)
    reboot    ~                         Sun Apr  3 11:03
    sampson2269  console                   Mon Feb 28 05:36 - crash (34+04:27)
    apesfrep  console                   Sun Feb 27 18:31 - crash (34+15:32)
    sampson2269  console                   Thu Feb 24 19:09 - 18:31 (2+23:21)
    reboot    ~                         Thu Feb 24 19:09
    shutdown  ~                         Thu Feb 24 19:08
    sampson2269  console                   Tue Feb 22 18:22 - 19:08 (2+00:46)
    reboot    ~                         Tue Feb 22 18:21
    shutdown  ~                         Tue Feb 22 18:01
    apesfrep  console                   Mon Feb 21 12:01 - 18:00 (1+05:58)
    sampson2269  console                   Sun Feb 20 11:14 - 18:01 (2+06:47)
    reboot    ~                         Sun Feb 20 11:14
    shutdown  ~                         Sat Feb 19 21:55
    sampson2269  console                   Sat Feb 19 18:21 - 21:55  (03:33)
    reboot    ~                         Sat Feb 19 18:21
    shutdown  ~                         Sat Feb 19 15:09
    sampson2269  console                   Fri Feb 18 16:11 - 15:09  (22:57)
    reboot    ~                         Fri Feb 18 16:11
    shutdown  ~                         Fri Feb 18 16:11
    sampson2269  console                   Fri Feb 18 10:59 - 16:11  (05:11)
    reboot    ~                         Fri Feb 18 10:58
    shutdown  ~                         Fri Feb 18 05:25
    sampson2269  console                   Thu Feb 17 21:18 - 05:25  (08:06)
    apesfrep  console                   Thu Feb 17 20:43 - 21:18  (00:34)
    sampson2269  console                   Thu Feb 17 20:33 - 20:43  (00:09)
    apesfrep  console                   Thu Feb 17 19:41 - 20:10  (00:29)
    sampson2269  console                   Wed Feb 16 09:54 - 19:41 (1+09:46)
    reboot    ~                         Wed Feb 16 09:48
    shutdown  ~                         Tue Feb 15 22:14
    sampson2269  console                   Tue Feb 15 06:12 - 22:14  (16:02)
    apesfrep  console                   Mon Feb 14 18:14 - 06:12  (11:57)
    sampson2269  console                   Sun Feb 13 21:06 - 18:14  (21:08)
    reboot    ~                         Sun Feb 13 21:05
    shutdown  ~                         Sun Feb 13 21:05
    sampson2269  ttys000                   Sun Feb 13 20:13 - 20:13  (00:00)
    sampson2269  console                   Sun Feb 13 19:36 - 21:05  (01:28)
    reboot    ~                         Sun Feb 13 19:36
    sampson2269  console                   Sun Feb 13 15:18 - crash  (04:17)
    reboot    ~                         Sun Feb 13 15:18
    reboot    ~                         Sun Feb 13 15:17
    root      console                   Sun Feb 13 15:11 - crash  (00:06)
    sampson2269  console                   Sun Feb 13 14:53 - 15:11  (00:18)
    root      console                   Sun Feb 13 14:44 - 14:53  (00:08)
    reboot    ~                         Sun Feb 13 14:43
    System Specs.
      Model Name:          iMac
      Model Identifier:          iMac11,3
      Processor Name:          Intel Core i7
      Processor Speed:          2.93 GHz
      Number Of Processors:          1
      Total Number Of Cores:          4
      L2 Cache (per core):          256 KB
      L3 Cache:          8 MB
      Memory:          16 GB
      Processor Interconnect Speed:          4.8 GT/s
      Boot ROM Version:          IM112.0057.B00
      SMC Version (system):          1.59f2

    I used to be a huge pc user, actually built them for a living for awhile. Got sick and tired of fixing them all the time and having friends call with issues almost everyday. So 3 months ago i made the switch and all i can say is that i dont regret it one bit. My imac has been great other than this issue i just reported. But i did put 16gb of corsair ram in it and that could have been the problem. My guess is that i just needed to reset everything after putting this new ram in and wallaaaa. If you are looking to make the switch i can garantee you wont regret it.

  • Has anyone had a problem with the imac just shutting off for no reason

    My imac will just shut off without warning.Has anyoneelse had this problem?

    I don't have to be doing anything or be anywhere near the computer.
    The machine feels warm but i don't know if thats normal or not.
    Imac, 20-inch,mid 2007
    Processor 2 GB  intel core 2 Duo
    Memory 2 GB 667 MHz DDR2 SDRAM
    Graphics ATI Radeon HD 2400 XT 128 MB
    Software OS X 10.8.2 (12C54)
    No third party extensions that Iknow of

  • IMac suddenly shut off.

    I was using my iMac earlier today when it suddenly shut off. The only programs I had opened were Safari and iTunes. I put my hands on top of the computer and noticed that it felt especially hot. Could the cause of my iMac shutting off be because it got too hot? Should I be concerned about possible damages that may have occurred? I appreciate your help.
    One more thing; my iMac won't go to sleep according to the inactive time that I have specified in the Energy Saver settings. It only goes to sleep when I access the sleep command or push the power button. Otherwise it just stays on. Thanks again.

    Thanks for all your replies, guys. I hadn't logged in since Monday so I didn't know that there had been more posts since then. Anyways, to address why there hasn't been a recall or any public recognition of the problem (that I know of), I have a theory: after all the Apple commercials that basically boil down to "Macs are better than PCs because Macs work," how bad would it look that they would have to do a major recall on these new iMacs?
    This is actually my first Mac. I was really stoked about it because everyone that I spoke to that had owned Macs never had any complaints. I'm getting a little concerned now. We've spent good money on these machines and apparently for a lot of us they are turning out to be a major headache. If I wanted a computer that performed poorly I would have bought a PC and spent half the money (sorry to all the PC guys out there. I've had some bad experiences with PCs that helped fuel my decision to purchase a Mac).
    Anyways, I've had another unexpected shutdown earlier today so I'm going to call Apple again and see what they say. For any of you who are having this problem and are going to call Apple for the first time, your support may go something like this: turn the computer off and turn it on again holding the Command, Option, P and R buttons simultaneously. Then, using the Disk Utility, you will verify the disk. Mine claimed that everything "seemed" to be okay and as of Monday I was to monitor my system and call back if it happened again. I'm going to call them again and I'll let you all know what they say.
    Dennis, thanks for the link. I have not read it yet, but I will. I'll keep you all updated. Thanks again and good luck to all of you as you try to get your Mac issues resolved.

  • IMac Retina shuts off USB ports when sleeping

    I have a new iMac Retina i7 with 32GB RAM running Yosemite. Approximately 60% percent of the time, when the iMac goes to sleep, it shuts off all of the USB ports. This includes dumping hard drives without properly ejecting them, as well as shutting off powered USB hubs. Switching the drives and hubs around to different ports does not help the problem, and it appears to be becoming more frequent. Any suggestions would be welcome.

    I too am having hub issues with my 5K iMac. I purchased an Amazon Basics hub, that never worked at all. I returned it and got one made by vantec. I have two external hard drives connected to it, and they always are recognized after sleep or restart. But other things get dropped, like my two printers. I seem to be able to resolve the dropped hub ports by ejecting my external hard drives and then unplugging the power to the hub, then reconnecting the power. When i do, all the indicator lights come on again, and things work.
    I am working with Vantec about this issue, they have been terrific by email, and they are offering to replace the hub. But now I am wondering if something more basic is wrong, like this SMC reset that has been mentioned in this thread. I was about to ask if that was hard to do, but I just looked at the link provided by Ralph, and doing it is easy-peasy. I will give this a try, and try to remember to report back.
    thanks, Peter

  • My iMac Intel shuts off by itself and restarts

    Hello,
    This mac seems to sort of shut off on it's own. It doesn't completely turn off though. It doesn't really go through the boot process... it just goes back on as if it were sleeping. Unfortunately, it does it while I'm working on it. I could be just surfing the web.
    Can anyone help?
    Thank You,
    Marc

    Hello the:
    Could be a number of things (probably not software).
    Try resetting the SMC:
    http://support.apple.com/kb/HT3964
    Barry

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