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MacBook doesn't boot, shuts down after releasing power button

My Macbook pro easrly 2008 2.5Ghz with the 512MB Nvidea chip has stopped working.

1. - When I push the powerbutton, the system tries to startup, but immediately shuts down after releasing the powerbutton. This happens with all three options of the AC adapter, battery and AC + Battery connected.

2. - When I push and keep down the powerbutton the system tries to startup, but shuts down randomly. Sometimes I hear the DVD drive click, but the system shuts down after a while (timing is different everytime I try) normally shutting down is preceded by the SIL (Sleep Indicator Light) blinking very rapidly for a short period. This behaviour is the same wether or not I try with the powerbutton pressed down, or released after hearing the DVD drive clicking.

2a. - Immediately trying to power on the system again results in a very quick restart (but fails within 1sec) or the system starting up itself after not being touched for a few sec.

3. - Removing both DIMMs from their RAM slots starts up perfectly with just a press on the powerbutton and gives me the usual result as would on any Mac. System beep every x seconds.

4. - Reinstalling 1 of the DIMM's in either RAM slot gives exactly the same behaviour as in 1. and 2.

I have already reset the PMC (hold powerbutton for 10s) several times. With RAM installed and without. As well as resetting PRAM (startup with command-option-P-R).

If anybody has a clue as to a solution or fix I would appreciate it a lot :-)

Many thanks in advance!

Answered! View the answer I have this problem too

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When the system shuts down does the sleep LED on the front lit and is it fading in and out (sleep mode) or steady.

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Hi, Dan

Thanks for looking. The system goes completely down. No LED and no Fans spinning.

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I do agree with Jack here but for a different reason. Apple has announced end of life (EOL) for this model for next month so your options for service will be limited. In this case I suspect your NVIDIA GPU is giving you trouble. IF thats correct you'll be able to get a logic board exchange for just the bench fee via Apple.

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Take it to an apple store. The problem might be in the firmware. They can fix it for free.

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The closest Apple Store is 250km, so I would need to plan going there. But I will call them tomorrow and see if they have any idea and time to look at the problem.

Thanks!

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With your new info - Your logic board is definitely having problems! As you can't sustain it on very long you will have a hard time diagnosing it down. The GPU issue is still possible, but you could have a some other possibilities here as well.

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Joachim Ottow will be eternally grateful.
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