Previous 1 2 3 Next 76 Replies Latest reply: Oct 9, 2015 9:00 AM by David K Oberlin Jr.
MotleyPete Level 1 (0 points)
When I start my Mac Pro by pressing the power button the fans kick in and it sound like it's about to start for a second, then it immediately switches itself off. This happens time after time every morning. After unplugging everything from the back and plugging it all back in again I can often get it to start up, eventually, then it's usually fine for the rest of the day. Next morning, same problem. It's very disconcerting.

This problem has only started to happen fairly recently and I'm pretty sure the warranty has expired. Can anybody help?

Apple Mac Pro "Eight Core" 2.8 (2008), Mac OS X (10.5.2), 4GB RAM, 500GB HD, NVIDIA GeForce 8800 GT
  • MotleyPete Level 1 (0 points)
    Note: This morning I managed to start it up by unplugging some peripherals (hub, external hard drive, speakers), then turning it on. However, I have no idea if it was the unplugging that helped or the fact that I left the machine for 10 minutes before trying again. It's difficult to say.

    However, my machine has never had a problem like this with these same peripherals plugged in before, so I'm at a lost to understand what is going wrong here.
  • Dale Weisshaar Level 6 (15,860 points)

    Sounds like you might need a SMC reset.




  • MotleyPete Level 1 (0 points)
    Unfortunately I have already tried that last week (as well as a few other things) and while the problem seemed to go for a few days, it returned again. This morning my Mac pro started up with no problems.

    The next time this issue occurs I shall try to fix using one method at a time.
  • jpgav Level 1 (0 points)
    I've been having the same problem for 5 months now and it seems to be getting worse!

    Did have a spell when it was fine for over 3 weeks then one evening powered up, got as far as chime and gray screen/apple logo then clicked off. Since then it's hit and miss as to how far through the start up process it gets.

    Fed up with it!

    Unplugging seems to help as does moving but only for a short time.
    Have taken it in and had it looked at to no avail, suggestions being to try a new power supply or logic board. Going to start getting expensive!

    Seen similar faults but rare!??
  • Dale Weisshaar Level 6 (15,860 points)
    MotleyPete wrote:
    Unfortunately I have already tried that last week (as well as a few other things)

    What else have you tried?

  • Alexander Valenzuela Level 1 (35 points)
    it sounds like an issue I was having with my Mac Pro earlier this year, as it would turn off and not turn back on (which I believe a black out in the neighborhood was the culprit). I eventually took it in to the Genius Bar where they fixed it. It was the Logic Board and PSU that they replaced. Everything (in terms of powering on) was fixed after that point, although I do have a new issue. lol.
  • The hatter Level 9 (60,930 points)
    Buy a good solid 1500VA UPS and protect your equipment.
  • MotleyPete Level 1 (0 points)
    Hi Dale. The other things were zapping the PRAM and also running Onyx to clear a few things out (just as a voodoo measure I'm sure).

    I had the problem again this morning and unplugging peripherals (one at a time) didn't help. I'm suspicious (probably superstitiously) though that it may have something to do with the Apple display screen as it connects to the Mac via USB as a way to turn itself on and off. A few months ago I adjusted the angle of the screen and the screen spontaneously turned itself off, I presumed it wasn't plugged in properly at the time and I have no idea if this is connected to the current problems I'm having. I'm also suspicious that there may be a power issue due to how many peripherals are plugged into the same extension as the Mac, so I'm going to try limiting that too.

    This morning however I have opened the Mac up and found it to be incredibly dusty inside. I'm off to buy some canned air and will try clearing the dust out. I'll also move the Mac to a less dusty and more easily serviceable position.

    Thanks for your input guys and I'll let you know how I get on.
  • MotleyPete Level 1 (0 points)
    OK, I cleaned out the dust inside (which was considerable), turned my Mac on (with nothing but it and the display plugged ), same problem as before. It attempted to start up for a second then switched off.

    Now here's the strange part. I noticed the light in the Apple display was on, so I pressed the button on the side of the display a couple of times to turn it off. Then started the Mac up again. This time the Mac started up for a few seconds longer, the cinema display didn't turn on & the Mac again promptly turned itself off. I pressed the Macs power button to turn it on again and it started up, started the Display and now I'm typing this message from my Mac Pro.

    Am I crazy, or does this startup power issue somehow seem to be related to the Apple cinema display?
  • Len Graves Level 1 (15 points)
    Have the same problem, push the start button, runs from 2 to 60 seconds, shuts down. Tried all the fixes suggested on this site, no joy. Took to the repair shop (twice) and they could not duplicate the problem after several days each time, so brought it home and worked o.k. for a couple of weeks and then started doing the same thing. The third time I took it to the shop,we plugged it in while I was there and it would not start. They ordered a power supply and I should have it back tomorrow. Glad I have applecare.
  • MotleyPete Level 1 (0 points)
    The Mac ran fine all weekend, but I turned it on this monday morning and the problem was back again.
    This time I unplugged everything from the back, plugged it all back in again and It stared up fine. Very, very strange.

    I'd be interested to know if a new power supply fixes it for you (are these things known to fail after only a couple of years?). I don't have Apple care, so if I need to take it in somewhere and get a new power supply it's going to be quite expensive for me.
  • Dale Weisshaar Level 6 (15,860 points)
    Why not, try running your Apple Hardware Test . It's not perfect, but may flag something.




  • Len Graves Level 1 (15 points)
    Will definitely let you know if this cures the problem.

  • MotleyPete Level 1 (0 points)
    Thanks Len, I appreciate that.

    Dale, Will do. I'll try the Hardware test when I manage to get the Mac Pro started again this morning.

    What I find incredibly odd about this issue is the fact that it only happens in the mornings. Once I eventually get the Mac started through a seemingly random plugging and unplugging of things, the Mac will then work fine for the rest of the day and can be turned on and off as a many times as I like.

    It seems the problem only occurs after the amount of dormant hours you get from a nights sleep. It's very peculiar.
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