Previous 1 27 28 29 30 31 Next 499 Replies Latest reply: Nov 27, 2015 11:54 AM by Linda Cameron Go to original post Branched to a new discussion.
  • Firehawk911 Level 1 (0 points)

    That's funny you mentioned the USB because that crossed my mind after I noticed that several restated occurred while I had a device connected to the upper USB port. Since then I've tried not to use it but the problem did still continue. However I've left it on for over a week straight now due to heavy workload and no break to stop and try to remedy the problem. Thank goodness it's hanging on still.

    I'll add that on my list of things to try as soon as I get enough work done so I can shut it down.

    How do you circumvent a USB hub?

  • Grant Bennet-Alder Level 9 (56,565 points)

    If you are running a USB cord from your Mac to an external USB Hub (a discrete sharing device for attaching multiple USB devices) you bypass that by rewiring so the USB devices are plugged into different Hubs (like on displays and such ) or direcltly into USB ports on the chassis.

  • Firehawk911 Level 1 (0 points)

    I'm not using a USB hub at all.  I have devices attached directly to various ports (monitor, tablet, printer) but I leave the front 2 free and use them temporarily for flash drives, card readers, ext HDD when needed.

    I think I misunderstood.

  • baronial Level 1 (0 points)

    In my case I was already down to only to 2 attachments to my USB 10 port hub, my mouse and keyboard, which were acceptable for my proposed running of the Apple Hardware Test. However, in a last ditch effort, I cleared out the 2 USB connections on the front of my MacPro and plugged those essential peripherals into those ports and immediately, with the hub totally clean, all my spontaneous start problems were cured. I don't remember if I had disconnected the empty hub at the point, but I sure did shortly.  I'm on my 3rd day of bliss. 7 more days until the ETA of my new 10 USB port hub. Having my old Pro 1.1 working like new is a big, big grin. My memory had failed me as I had this exact problem 5± years ago and had forgotten the lesson learned - cuda saved a lot of time and grief. Fortunately I have a MacBook Pro I can use for emergencies, Skype and family history recording, when I need a camera 

  • netcrasher020 Level 1 (0 points)

    i have mbp 15 mid 2010 and same problem..when u use camera,open skype,play movie,use usb hd,open google etc..i been read all of issue and last option is logic board yes it will solve your problem...but what i did to my mbp is hardware i'm a cellphone technician and iphone hardware tech..some issue will be same as mine but for my mbp is already solve i just remove some filter and make jumper on it..but before i find my solution i did a lot for reading about supply voltage to mbp hd so i try one by one filters to make jumper and test my mbp run all program that makes my mbp shutdown...after that jumper my make works i try to remove that jumper cable to see it that problem comes back..and again the same problem!!! so i return that jumper and close my mbp hit power on and use..its been 5 days now since that simple hardware solution my mac works fine..for me its not software,not logic board...

  • Robert P Level 1 (35 points)

    Hi netcrasher 020, you might get more help on the mbp section, this is the Mac Pro (tower) forum

  • Jim Bones Level 1 (0 points)

    Hi Folks,


    I was having continuous restarts until I got a "battery out" display.  I replaced the CR 2032 button battery inside the case and all problems went away.  Sleep function is not a problem anylonger either.  That was a cheap save to try first and it worked.


    Thanks for the tip



  • RGrebrad Level 1 (0 points)

    Reply To All,


    I think I was able to fix this re-starting problem on my Mac.  My 2008 Mac Pro (Quad-Core Intel Xeon, running OSX 10.5.8) was always no problem until a few weeks ago when the spontaneous re-start problem began.  Once this started, it was a pretty consistent problem (did it every day for 6 days in a row), and seemed to be getting worse (on the last day, 5 consecutive re-starts until it finally stabilized).  I installed the Temperature Monitor application (free download from Bresink), and saw that Memory Modules A1 A2 B1 B2 all had rapidly climbing temps after start-up, getting to above 60C.  Then I installed the smcFanControl_2_4 application (free download from  It showed that my default fan speeds were set low (from 499 - 799 rpm, depending on which of the 4 fans), and failing to respond to elevated temps by increasing fan speed (as I think they should do, automatically).  I used smcFanControl, to set the default min fan speeds to just above 1000 rpm for all four fans.  After a few minutes, the memory modules temps had all decreased by about 15C (to the low-mid 40's), and the heat sink temp was lower also.  I have not had any more trouble since then (it has been over a week), so I think that this fixed it.  My guess is that the Mac Pro fan control tends to keep the fan speeds a bit too low, leading to borderline overheating of memory, leading to a re-start hiccup.  With just a minor uptick of fan speeds (1000 rpm is still pretty low for these fans, nowhere near max), things seem to be OK.  Hope that this helps some of you with a similar problem.



  • Grant Bennet-Alder Level 9 (56,565 points)



    Do you have a reference article for that modification? Could you post a link to it?


    If you invented it yourself, it seems like YOU should write an article and post it somewhere, in any Language!

  • plugsandpixels Level 1 (10 points)

    I foud this thread because I have been tweaking a 2007 (2,1) Mac Pro that was given to me by a colleague who had been having some sort of grief with it (had the video card replaced, etc.). He gave up with it. I received it, plugged it in and booted from an external drive – no problem! It has been running fine for some weeks; I have been adding hard drives and optical drives, Boot Camp, etc. The only odd thing was upon booting one day the fans revved at full speed, but a quick reset (via unplugging the cord) cured that.


    Today I decided to clean the insides (there were minor dust bunnies). Upon restarting, I suddenly got the spontaneous reboots for the first time – even in Boot Camp as Windows 7 loaded. Since I had pulled the RAM and all HDDs out for the cleaning, I figured I'd swapped the order of the RAM risers. So I reswapped them to see what would happen.


    That fixed it; for hours since it has not rebooted on its own.


    So maybe this is a RAM issue for everyone?


    I also installed the fan control software as mentioned above which is a nice thing to have and sped them up a bit.

  • Jodyberry Level 1 (0 points)

    BIG BIG Thanks to RGrebrad!


    Hopefully your idea may have solved my problem!   I have a G5 Quad Core 10.5.8 and the last week or so it has just restarted randomly.  After trying to narrow the problem down to hard drives, internal cards, external drives, etc., we took it to an Apple repair shop.  He had it running for 6 hours with no problem. 


    Well, back home with the computer and issues start up again while using it.   It seemed to really happen when I was rendering anything, (Final Cut and After Effects) so I thought it might be an extra load on the CPU or RAM.    Then I found this thread.  YAY!!


    It's been an hour with all my original peripherals hooked back up and it's still running.  RAM modules are staying around 48 to 50 C.  Although I did have a few questions for anyone that might know;


    1.  Is there a way, either in OSX or SMC Fan control to raise the fan RPM level when the temps go up on my RAM or CPU?   I know that I can set different presets in SMC, but I think I would have to select those manually when I think temps might be going up.  I'd like it to happen automatically.


    2.  Is there a list somewhere that shows what decent temperatures SHOULD be?  RGrebrad mentioned a few but I'm curious if there's a list that shows a good temperature range for all the other sensors in my Mac Pro.


    Once again, thanks RGrebrad for the idea and I hope it keeps my system up!   BTW, how has your system been doing?

  • Grant Bennet-Alder Level 9 (56,565 points)

    1.  Is there a way, either in OSX or SMC Fan control to raise the fan RPM level when the temps go up on my RAM or CPU?

    That is what Mac OS X is already doing automatically.


    When you use SMC Fan Control, you are just raising the "floor" level that the fans will not go below. As always, as Temps go up, fan speeds should increase.

  • Robert in Hawaii Level 1 (25 points)

    It sure seems like on many machines this fuctionality is not performing adequately. The idea of it being a fan regulation problem with resultant overheating also helps explain why software glitches that overdrive the CPU can lead to restarts, which is what I observed. (I solved my restarts by replacing the software, but it was apparently not the root of the problem.)

  • RGrebrad Level 1 (0 points)

    >>>>When you use SMC Fan Control, you are just raising the "floor" level that the fans will not go below. As always, as Temps go up, fan speeds should increase.


    Yes, this is correct.  I just think that in some cases (such as mine), the Mac Pro is failing to automatically increase the fan speeds when it should, causing the restarting problem.  By increasing the default minimum (or floor) to 1050 rpm for all four fans (using SMC Fan Control), I was apparently able to fix my problem (so far, it is still working fine).  Presumably the fans will still increase above these new default minimums when needed.  Back when I was having trouble, after 5 consecutive restarts, the thing finally came on and stayed on all day, but I could hear that the fans were running at a very high speed (not sure what rpm, since I hadn't installed my new apps yet).  I think that when it was moderately hot, it failed to increase the fan speeds automatically (causing the restart problem), then it got even hotter, and it finally sensed the temp problem and jumped the fans up a lot (probably a lot more than necessary), allowing it to run for the remainder of the day.  By increasing the default minimums using SMC Fan Control, it looks like I can avoid all this.

  • Firehawk911 Level 1 (0 points)

    Wow! The various solutions are all over the board, from br2032 batteries, RAM, logic boards, PSU, usb, dust, fan control and more!

    I've been following this thread and am going to work my way through all the solutions until hopefully mine is solved too. Until then, my workload has not let up so as another user said, I'm just leaving mine on all the time to avoid the restarting spasms.  Because the restart problems seem to happen within the first ~30 minutes of powering on. It's been left on for over a month straight now! :)

    I've almost got my new machine ready to go and as soon as I can, I'm going to shut down my Mac pro and start trying all these solutions while I can keep working with my new machine.

    Thanks again to everyone for all the info.

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