13288 Views 39 Replies Latest reply: May 14, 2012 9:30 PM by bbolander
Currently Being ModeratedOct 20, 2010 2:37 PM (in response to waltmorton)That looks like a power supply issue.MacBook Pro 17", Mac OS X (10.6.4), Mac Pro 2.66 Quad Core
Currently Being ModeratedNov 29, 2010 3:46 PM (in response to waltmorton)Hello,
it seems I have a similar problem since this morning... it look like others with the same Mac Pro has this problem too...
1. Just after starting my day, I heard a "click" and suddenly my Mac Pro restarted (well try to) several time on itself . I had to manually push the power button to stop this.
2. After lot's of emotions I started it again... and It finally boot and goes fine for a few hours...
(I quickly run a few backups... and did some hard disk testing, seems fine).
3. it happens again when the computer was "on sleep" as soon as I started it, the problem came again again the same way.
I am also suspecting a *power supply* issue (I never had this problem but I already had to replace the PCI video card on this computer)
I will try call Apple tomorrow to fix this.
Did you get more info since from your side ?
EricMacPro 3.2 Ghz (early 2008) 8Go/4To — iPhone 3Gs 16Go, Mac OS X (10.5.8), G5 Quad 2.5Ghz 4Go/2To 10.4.11 (old sys: G4;G3B&W;PismoG3;Quadra650)
Currently Being ModeratedDec 1, 2010 4:00 AM (in response to waltmorton)My early Mac Pro has a similar problem. It takes up to 30 reboots to get the start up chord and a steady "on" light. Once working it is fine all day but on the many occasions that it does not start first thing (can take up to half an hour every morning!!!) I get a slow blinking light and a black screen. I have changed the system disk with a clean install of Snow Leopard PRAM, tried disconnecting everything including internal disks, reseated the ram, taken out the PCI cards but the problem continues. It all seems to happen in the first couple of seconds. The fans come on but if the power light is blinking It won't start..however a steady on power light will mean that it will work. Any solutions or known issues?Mac Pro, Mac OS X (10.6.5), Mac Pro
Currently Being ModeratedDec 2, 2010 3:07 AM (in response to rickmusikstudios)Hi,
As indicated in my previous post (for me) my MacPro shutdown/restart after the first 5 min. I deactivated the "energy saving" to prevent suspending activity and it's fine for the rest of the day. To resolve temporarily the next start-up i've noticed that too: if I disconnect the plug before the first powering up, it almost goes fine afterwards without failure.
To me it definitively looks like a hardware problem (a power issue as Macbig said?). Also it seems my main system hard drive is disconnected during this problem, as time machine has to do a "Node requires deep traversal" afterwards too....) I still have a valid Applecare and I'll bring it to a certified apple expert as soon as I've finished my current design work. I'll let you when it will be fixed in the next one or two weeks (I hope).
to rick: if you have a blinking light (which I don't, it just clic/restart) look the following thread too.
EricMacPro 3.2 Ghz (early 2008) 8Go/4x1To — iPhone 3Gs 16Go, Mac OS X (10.5.8), PPC G5 Quad 2.5Ghz 4Go/2To 10.4.11 (old sys: G4;G3B&W;PismoG3;Quadra650)
Currently Being ModeratedDec 5, 2010 4:58 PM (in response to FunkyRico)I took my computer into my local Apple Store (Santa Monica) and they agreed something was wrong but could not diagnose -- they replaced the motherboard with a new motherboard. This DID NOT fix the problem. The workaround for me -- clunky solution -- Is:
(1) I set the computer to automatically start up at 6AM via the energy saver control panel. It does not do this but "something" happens internally - something gets tripped.
(2) Then, I turn the power ON & OFF at the power strip plugged into the wall before starting. I hear a "click" from inside the Mac Pro.
(3) Now if I hit the power button it starts up. Seems to run normal from there but freezes in SLEEP.
My personal theory is that one of the software updates beyond 10.6.x does not support energy management on this motherboard. Apple is not going to admit to that. What? Give me a new box?
I am still under Applecare...
I have very standard hardware but 3 internal 2TB drives. I have considered it is one of these drives that is not able to negotiate the start-up signalling or to handle sleep. Maybe. I have tried several different brands, they all exhibit the same behavior.Mac Pro 2008 Quad Xeon, Mac OS X (10.6.4)
Currently Being ModeratedDec 6, 2010 11:29 AM (in response to waltmorton)I have not confirmed this solution but possibly I have solved this by moving around and reseating RAM modules on the memory risers and removing 2 modules...Mac Pro 2008 Quad Xeon, Mac OS X (10.6.4)
Currently Being ModeratedDec 7, 2010 2:03 AM (in response to waltmorton)Hello,
Thanks for your feedback, I still did not have the time to bring my MacPro to a certified expert, I will do it for sure but I need to finish a few works in progress... (I'm doing a lot's of backups then...).
*My actual workaround is unplugging the power cord during the night, and it does not stop and stays on almost ~8 hours or more fine.*
To me, it cannot be the system, I'm using 10.5.8... but I also have 4 internal hardrives, Three PCI cards (display, small eSata controller, and blackmagic video card). I did not install any hardware since one year. So it's definitively a hardware issue, and the way it happen, it is certainly electric (I doubt that it's a RAM issue).
Good luck, I'll keep inform later,
EricMacPro 3.2 Ghz (early 2008) 8Go/4x1To — iPhone 3Gs-16Go, Mac OS X (10.5.8), PPCG5 Quad 2.5Ghz 4Go/2x1To 10.4.11 (old sys: G4;G3B&W;PismoG3;Quadra650)
Currently Being ModeratedDec 7, 2010 7:00 AM (in response to FunkyRico)Just looking for other information in the meantime... i've found this:
As I have four of this Samsung HD 1 To, I was wondering about what's mentioned in the middle of the second paragraph:
"(...) +Often bad power supply unit combined with power streak is enough to burn spindle driver chip on the electronics and make data inaccessible. Should this occur the computer would reboot itself or shutdown completely, you would normally notice acrid smell and smoke and the drive will no longer spin up.?+"
But as far I'm concerned, I don't have, smell, smoke or any data problem (yet). Btw it just "cut off" again after 5 hours of Power ON during an After Effect Render...
mmhhh...MacPro 3.2 Ghz (early 2008) 8Go/4x1To — iPhone 3Gs-16Go, Mac OS X (10.5.8), PPCG5 Quad 2.5Ghz 4Go/2x1To 10.4.11 (old sys: G4;G3B&W;PismoG3;Quadra650)
Currently Being ModeratedDec 7, 2010 3:55 PM (in response to waltmorton)hi everyone.
I also have recently got this problem. Press power ON . and the Click sound and goes off. sometimes starts booting up for longer but then Click and OFF again. Then sometimes works for few hours and Click Off again.. Hardware tests (extended version) says "No trouble found". ha!!!
More odd thing today was when pressing "Build and Run" on XCode would keep shuting the computer down with that CLICK.. so I would restart (it restarted well today) . but again same with that... happened 10 times.. so looks connected when processor was making some effort. i just don't have an idea.
Computer is also a Mid 2008 Mac Pro...
Anyone found any solutions or diagnosis of what is going on...???? Gone though quite a few forums... clean this, change that, and for some it works, for others it doesn't .
I will also get this computer to a repair person.. and if they find a solution.. will post what i find.
back to working on this slow old macbook and backing up everything 5 times a day.. just incase.mac pro, Mac OS X (10.6.5), macbook, ipad, blah blah etc and an old g3 kicking around, and powerbook g4 (wellcool)
Currently Being ModeratedDec 7, 2010 6:30 PM (in response to FunkyRico)FunkyRico-
waltmorton says his problem was not affected by changing the coin cell battery on the motherboard. But yours may be.
If you have not tried a new BR 2032 3Volt Lithium coin cell battery, you should try that before any of the more expensive or disruptive options.Beige G3, G4/867, G4/dual 1.25 MDD, MacPro'09 w cheap SSD, Mac OS 8.6 or Earlier, and 9.2, 10.5 and Server - LW IIg, LW 4/600, ATalk ImageWriter LQ
Currently Being ModeratedDec 7, 2010 6:59 PM (in response to Grant Bennet-Alder)Yes IN THEORY this behavior is what you would expect if the battery on the motherboard was dead or there was some problem with PMU management (I have tried resetting PMU both from front of computer and directly on motherboard -- no luck, does not resolve issue.) I encourage others to try a PMU reset as a solution (Google Apple PMU reset) .I have tried a new battery as well. I have moved RAM around and tried a lot of RAM configurations, including minimal OEM RAM. No effect. Does not resolve the "on button" problem. I suppose the solution could be an entire new power supply but that seems odd since the power supply does work, just does not turn on reliably without the mysterious click. It is 3 yrs old... would not surprise me if it had a limited life. That "click" noise is an electronic relay of some type, that much is almost certain. Bad relay?
Message was edited by: waltmortonMac Pro 2008 Quad Xeon, Mac OS X (10.6.4)
Currently Being ModeratedDec 7, 2010 10:19 PM (in response to Paulwebb)Paulwebb, another thing I am looking at to try to solve this issue: do you experience this "click and fail to start" ONLY when you have external USB devices plugged in?Mac Pro 2008 Quad Xeon, Mac OS X (10.6.4)
Currently Being ModeratedDec 7, 2010 10:47 PM (in response to waltmorton)And take a look at this thread where the explanation is ID'd as a USB issue:
http://discussions.apple.com/thread.jspa?threadID=2628034&tstart=480Mac Pro 2008 Quad Xeon, Mac OS X (10.6.4)
Currently Being ModeratedDec 8, 2010 1:20 AM (in response to waltmorton)I will see if removing USB make a difference. This morning its starting up fine and so far its working, so am waiting for the issue to return ( ) . Was surprised with google searching just how many many people have / had this issue, and for different models going back many years, and i also found some quite identical issues when search "random shutdown" in Youtube.mac pro, Mac OS X (10.6.5), macbook, ipad, blah blah etc and an old g3 kicking around, and powerbook g4 (wellcool)