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Q: Dual Quad-core Mac Pro reboots from sleep

My brand-new Mac Pro nearly always restarts rather than waking up from sleep. Just now I left it to go to sleep by itself and came back two or three hours later. When I touched the space bar, it restarted.

I have an IOGear firewire hub plugged in with nothing attached to it and lots of USB devices plugged in.

Dual 2.8 GHz Quad-core, Mac OS X (10.5.1)

Posted on Jan 20, 2008 7:09 PM

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Q: Dual Quad-core Mac Pro reboots from sleep

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  • by jawhite20,

    jawhite20 jawhite20 Feb 2, 2008 6:00 PM in response to The hatter
    Level 1 (0 points)
    Feb 2, 2008 6:00 PM in response to The hatter
    I returned my Dual Quad 2.8 for a new one and the new machine has no issues (knocking on wood).
  • by Tom Robbrecht,

    Tom Robbrecht Tom Robbrecht Feb 4, 2008 10:18 AM in response to transplant6
    Level 1 (15 points)
    Feb 4, 2008 10:18 AM in response to transplant6
    I have the same problem.
    Early 2008 Mac Pro dual quad core 2,8GHz 2Gb no 3rd party hardware.

    Sometimes it reboots, sometimes it wakes from sleep. I haven't been able to find a pattern. Problem occurs whether it was put to sleep manually or fell asleep automatically.
  • by JimRobertson,

    JimRobertson JimRobertson Feb 4, 2008 3:40 PM in response to Tom Robbrecht
    Level 1 (1 points)
    Feb 4, 2008 3:40 PM in response to Tom Robbrecht
    I'm curious. Does it reboot sometimes if you put it to sleep, then awaken it immediately? Mine has never done that (which complicates testing). It tends to reboot if it's been asleep for many hours. I've solved it for now by never sleeping the entire computer, but it makes VIRTUALLY no noise when the drives and displays are asleep, so I must be conserving SOME energy then while risking data loss less.
  • by Tom Robbrecht,

    Tom Robbrecht Tom Robbrecht Feb 5, 2008 12:37 AM in response to JimRobertson
    Level 1 (15 points)
    Feb 5, 2008 12:37 AM in response to JimRobertson
    No it does not reboot after a 'quick nap'.
    After 5 to 10 minutes though, chances of a reboot seem to dramatically increase.
    No pattern though, it sometimes wakes up fine from a good night's sleep.

    Tom.
  • by Trinity,

    Trinity Trinity Feb 5, 2008 1:52 AM in response to transplant6
    Level 4 (2,857 points)
    Feb 5, 2008 1:52 AM in response to transplant6
    Some posts ago, I said that my new Mac Pro was waking fine. Well, I have just installed 2Gb of RAM from OWC and now it reboots from sleep.
  • by Tom Robbrecht,

    Tom Robbrecht Tom Robbrecht Feb 5, 2008 4:19 AM in response to Tom Robbrecht
    Level 1 (15 points)
    Feb 5, 2008 4:19 AM in response to Tom Robbrecht
    Interesting : I cannot reproduce the problem when running Vista.
    This leads me to believe it might be Leopard-related.

    Tom.
  • by Trinity,

    Trinity Trinity Feb 5, 2008 5:57 AM in response to transplant6
    Level 4 (2,857 points)
    Feb 5, 2008 5:57 AM in response to transplant6
    I don't know if it is a hardware, software or firmware issue, but tomorrow I will refund the whole thing to the Apple online Store. I will buy it again when/if they solve the bug.
    I have been working for 7 years with a flawless G4 Cube and I don't want to downgrade to a buggy computer paying 2500 euros for it...
  • by JimRobertson,

    JimRobertson JimRobertson Feb 5, 2008 6:02 AM in response to Tom Robbrecht
    Level 1 (1 points)
    Feb 5, 2008 6:02 AM in response to Tom Robbrecht
    If I understand what you're saying, this is the first real clue that this isn't a hardware problem. By "running Vista" I assume you mean you're doing so via Boot Camp, so that the Mac OS isn't even apparent to the hardware. If that's the case, I'd say your report should reassure us all that it has something to do with Leopard's energy management.

    On the other hand, if you're running Vista under Parallels or Fusion, I haven't the slightest idea what the implications are (except perhaps that if you've not suspended the virtual machine, it doesn't really GO to sleep completely, and in that case there could still be an underlying hardware glitch.

    So, which is it?


    Jim Robertson
  • by Tom Robbrecht,

    Tom Robbrecht Tom Robbrecht Feb 5, 2008 6:35 AM in response to JimRobertson
    Level 1 (15 points)
    Feb 5, 2008 6:35 AM in response to JimRobertson
    I'm running Vista natively, so yes this is a strong clue the problem might be software related.

    By the way, you cannot put a host machine to sleep from a guest OS running in a virtual machine.

    Tom
  • by fantalbert,

    fantalbert fantalbert Feb 5, 2008 8:25 PM in response to transplant6
    Level 1 (20 points)
    Feb 5, 2008 8:25 PM in response to transplant6
    I have an "old" 2.66GHz Mac Pro, but I have a similar problem. About 20% of the time that I try to wake it from sleep, it either reboots immediately, hangs with no video or network presence, or (rarely) gives me the multilingual kernel-panic screen.

    I'm mentioning this here because some of you are speculating that it's a Leopard-related thing. You may be right, because I used this computer for nine months with Tiger and never had a single problem waking it up.
  • by Tom Robbrecht,

    Tom Robbrecht Tom Robbrecht Feb 6, 2008 12:49 AM in response to transplant6
    Level 1 (15 points)
    Feb 6, 2008 12:49 AM in response to transplant6
    Ok, a brief summary of this thread up to now :

    _Affected hardware_:
    Early 2008 Mac Pro w/ dual quad core, all CPU speeds
    _Operating system_:
    OS X 10.5.1
    Symptoms:
    Mac reboots after sleep instead of waking up, chances of reboot seem to increase with length of sleep.
    Solutions:
    Reset PRAM : apparently not effective
    Reset SMC : apparently not effective

    From my personal experience, this problem is difficult to simulate consistently, though it seems to be a software issue and is not necessarily related to 3rd party hardware.

    I would welcome results from other users :

    1. Running windows natively (XP or Vista whichever) : can the problem be reproduced ?

    2. Running any OSX version lower than 10.5.1 : anyone have this problem ?

    3. Anyone start experiencing this problem on older hardware only after an upgrade to Leaopard ?

    Tom.
  • by The hatter,

    The hatter The hatter Feb 6, 2008 3:53 AM in response to Tom Robbrecht
    Level 9 (60,935 points)
    Feb 6, 2008 3:53 AM in response to Tom Robbrecht
    The report on AYM on 2008 feedback, some people just don't sleep their system for now.

    SMC button was removed, wasn't it? no longer have the button under drive #4 that before you could physically press to do SMC Reset. And unplugging my unit (2006) didn't result in a "full" SMC reset when I needed to once. Zapping PRAM/NVRAM might have.

    PS: I run Vista on my 2006 unit, but I have to use InputRemapper to boost the fans to keep it from getting too warm as the fans aren't kicking in automatically based on thermal sensors. Do yours? Your system has later EFI firmware and better support for Vista, so I hope so.
  • by Chateaubugs,

    Chateaubugs Chateaubugs Feb 6, 2008 7:18 AM in response to transplant6
    Level 1 (95 points)
    Feb 6, 2008 7:18 AM in response to transplant6
    Same here. The problem started after about one week and aside from a factory installed Airport and two extra hard drives that I put in, the configuration is essentially stock.

    Here is more on the subject:

    http://weblogs.baltimoresun.com/business/appleaday/blog/2008/01/justwake_my_mac_pro_whenits.html
  • by islk350,

    islk350 islk350 Feb 6, 2008 1:26 PM in response to Trinity
    Level 1 (65 points)
    Feb 6, 2008 1:26 PM in response to Trinity
    Trinity, if you remove the OWC RAM, does it work again? With the OWC ram, does it ever sleep-wake correctly? How long in sleep does it require to cause the reboot? Seconds, minutes, longer?
    Can you do two things: 1. open a terminal window (click on terminal app) and type

    nvram -p

    return. Paste results here.

    2. post your memory config from the system profiler. paste here as well...
  • by Kevin Stanchfield,

    Kevin Stanchfield Kevin Stanchfield Feb 6, 2008 8:26 PM in response to transplant6
    Level 1 (110 points)
    Feb 6, 2008 8:26 PM in response to transplant6
    Add another new Mac Pro (2 x 2.8 Quad Core, stock ram) to the list. After a long sleep, it reboots instead of waking up.

    I also have the video card lockups.
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