my compuer turns on for half a second than shuts off!! help!

Discussion in 'MacBook Pro' started by apprentice55, Sep 3, 2010.

  1. apprentice55 macrumors newbie

    Sep 3, 2010
    Macbook pro intel core duo;
    My macbook is turned off, when I press the power button the light goes on and the computer starts making sounds of turning on for about half a second and than shuts off...

    I tried removing the battery and putting it again, I tried to hold the power button (the light flickers at one point and eventually shuts off as well after 2 seconds), and tried turning it on with the adapter plugged in and unplugged.

    Can anyone help me with this?? I'm desperate and no more warranty for me... )):

  2. TopHatPlus macrumors 6502

    Aug 1, 2010
    Southern Ontario
    did you by chance happen to change your ram recently? i changed my ram in my old macbook a month or so ago and i did not have it in enough and thats exactly what it did, booted up then shut itself off, if nothing else its worth checking.
  3. apprentice55 thread starter macrumors newbie

    Sep 3, 2010
    Thanks but your help topics didn't help..

    You see it shuts off as soon as I let go of the button. I have to screen nothing, you just hear it gearing up for a tiny moment then when i let go its off, so I can't even try holding any buttons or anything...

    And I didn't change my ram... Maybe I should try removing the ram and than putting it back in still??

  4. TopHatPlus macrumors 6502

    Aug 1, 2010
    Southern Ontario
    yeah they may have come a little loose, although i doubt this, when i changed my ram and it was not it it would start to boot and shut off, tried that like 4 times, and the went and tried re installing the ram, it should be pushed in quite a ways
  5. apprentice55 thread starter macrumors newbie

    Sep 3, 2010

    opened it tried to switch between the Ram cards, still the same )));

  6. AlphaDogg macrumors 68040


    May 20, 2010
    Boulder, CO
    It is likely a logic board failure. Replacement logic boards can get expensive, so it may be time to get a new Macbook Pro.
  7. diazj3 macrumors 6502a

    Jan 19, 2008


    I know this is an old post, but I´m having exactly the same problem...

    how did it turn out for you? what was the problem?

    Thanks. Any light on the issue will be of great help!
  8. Sueco macrumors newbie

    Oct 2, 2012
    Sorry to ask about it... but I have the same problem with my Macbook pro 17". No one knows what to do with it ... Yesterday I took off the hard disk and turned it on with a USB with OS Captain. It turned on perfectly and it went all the way to set up the OS ... I think it might be the old Hard drive but am not sure.
    Any advice???
  9. Samuelsan2001 macrumors 604

    Oct 24, 2013
    It is probably the HDD sata cable they are flaky in these models. Amazon sell them for under $20, while you are about it replace the HDD with an SSD it will transform your old machine more than you can imagine.,k:macbook pro mid 2012 sata cable,k:crucial+ssd+mx300

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