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  1. #1


    Member Since
    Apr 10, 2014
    Posts
    5
    Macbook Pro chimes and then switches off at boot
    Hi

    I have a Macbook Pro (MC374LL/A) which won't boot anymore

    I followed the recommended steps in the following links:

    http://support.apple.com/kb/ts2570

    https://discussions.apple.com/thread/5391976

    ...but wasn't able to obtain any improvement

    1) Safe boot doesn't work

    2) Reset the NVRAM / PRAM doesn't work

    3) Start up your Mac while holding the C key doesn't work

    The DVD I manage to enter is immediately ejected

    On each boot the grey screen lasts barely two seconds before the MBP switches itself off

    Any ideas ?

    thanks
    yann

  2. #2

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    34,536
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Try an SMC reset.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  3. #3


    Member Since
    Apr 10, 2014
    Posts
    5
    Thanks for your help

    Finally, I took the logic board out and cleaned the large amounts of dust,

    removed the radiator and cleaned (all) the excess cooling paste

    Treated both sides to a clear vinegar tooth brush cleanup

    Reassembled and, guess what ? It works !!!

  4. #4

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    48,224
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    Glad to hear it's working but I would be a bit apprehensive about using any kind of vinegar since it has an acid base. I hope you finished the cleaning job with isopropyl alcohol to get rid of the left over vinegar. And I assume you re-applied Arctic Silver thermal paste to the heat sink areas?

  5. #5


    Member Since
    Apr 10, 2014
    Posts
    5
    I rinsed the board with de-mineralised water and let it dry for 24hrs in a tupperware full of dried lentils

  6. #6

    pigoo3's Avatar
    Member Since
    May 20, 2008
    Location
    U.S.
    Posts
    34,536
    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Based on the info in the initial post...there certainly seems to have been something going on (symptoms) with this computer than was mentioned initially.

    Going to the relatively extreme measure of removing the logic board & cleaning it would not have been the first thing I would have done (with the initial info given)...I would have recommended some additional troubleshooting first.

    But hey...if this helped solve the problem...great! Congrats!

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

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