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    Strange shutdown (can't enter OS)

    Discussion in 'Apple and Mac OS X' started by Mobius 1, Mar 21, 2012.

  1. Mobius 1

    Mobius 1 Notebook Nobel Laureate

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    I don't know what's happening, my mac can't enter the os either win7 or 10.6 sl

    It always shutdown at the booting process and I don't know why...

    I even tried external boot disk and using another HDD

    Strangely, at boot selection, it can remain open and not shutdown but the fans go to max speed and the computer is very hot, this happens at either external hdd or internal

    And what's more if there's no HDD the machinecan stay open and not have an heat issue


    Anybody know how to fix this?

    Help appreciated
     
    Mobius 1, Mar 21, 2012
    #1
  2. saturnotaku

    saturnotaku Notebook Nobel Laureate

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    Tried resetting the SMC and PRAM?


    Sent from my iPhone using Tapatalk
     
    saturnotaku, Mar 21, 2012
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  3. Mobius 1

    Mobius 1 Notebook Nobel Laureate

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    Tried both multiple times, didn't work
     
    Mobius 1, Mar 21, 2012
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  4. Mobius 1

    Mobius 1 Notebook Nobel Laureate

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    Anyone? (bump)
     
    Mobius 1, Mar 22, 2012
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  5. gerryf19

    gerryf19 I am the walrus

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    Sounds like an overheating problem to me...Likely the cpu heatsink has come detached or perhaps their is an air pocket between it and the cpu or gpu.

    The system is shutting itself off to prevent meltdown.

    I'd open it up, remove the heatsinks, and clean off the cpou and heatsink then apply some thermal paste
     
    gerryf19, Mar 22, 2012
    #5