Mac Pro does not turn on anymore... sometimes

Discussion in 'Mac Pro' started by bnym, May 16, 2011.

  1. bnym macrumors newbie

    May 16, 2011
    Hi, I've read the threads and can't seem to find anything unique to my problem. I really need some help as the searches out there in google don't help.

    I have a Mac Pro Quad Core 2.8GHz and it was working fine until a few months ago. First it was turning off at unexpected times. I'd put it to sleep and even find it had shut down by itself after standing there to watch to make sure it went in sleep mode.

    So I took the whole thing apart, reset the PRAM and everything that I could do to try and fix it. Cleared the memory cache (or something like that). Even took the front and rear fans out to clean the dust out of it. After that when I initially started it up again, it would start up for about 1-2 seconds then turn off. I pressed it quite a number of times and it eventually booted into Snow Leopard OS (by the way, I even reinstalled all my software thinking it might be a software issue). So I got scared and backed everything up. But for the next two weeks it worked perfectly fine EXCEPT that I couldn't put it in sleep mode anymore. When I did that, it would shut down immediately. But I didn't care since I was happy that I could leave my Mac Pro on again the whole day.

    Well, 2 weeks later, and one day it just decided to not turn on again anymore. It would boot up and shut down after 2-3 seconds and after about 20 more times of trying, it booted up, and I was able to back up all my work again and after that I immediately turned it off.

    Please help! I really like this machine but it just has been so weird lately. I've turned it off and haven't used it since then. I've had to use Photoshop and Lightroom on my macbook air 11 inch which is HORRIBLE!
  2. ashman70 macrumors 6502a

    Dec 20, 2010
    Do you have Applecare? If so call them, if not make an appointment at a local Apple store and bring it in for them to take a look at. Some things that come to mind are:

    - Power supply issue
    - Heat issue causing the system to shut down
    - An electrical short somewhere, perhaps being cause my contact between the logic board and the case?

    Good luck.
  3. AWallen90 macrumors 6502

    Sep 15, 2009
    This seems to be a pretty common problem with PowerMac G5s. Is it possible it is the same issue only just now coming to light in the mac pros?
  4. nanofrog macrumors G4

    May 6, 2008
    There's been a bad batch or two of the PSU's used in the MP's (2008 models in particular).

    But as mentioned, if there's still Apple Care, it's best to set an appointment, and let Apple deal with it.
  5. odinsride macrumors 65816


    Apr 11, 2007
    Do you have a Monoprice USB hub by any chance? I had similar weird issues that I narrowed down to my USB hub. Replaced with a different brand and issues are now gone.
  6. bnym thread starter macrumors newbie

    May 16, 2011
    Thanks for the replies. Unfortunately I don't have apple care anymore. I've had the computer for over 4 years now and was running good until just a couple months ago.

    I guess I will bring it in to have someone look at it. I've just read a lot about how people have brought their mac pros in and was sitting there for months and when it came back the problem wasn't fixed. I hope I have better luck!

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