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!
Questa è una buona domanda?
2 Commenti
When the system shuts down does the sleep LED on the front lit and is it fading in and out (sleep mode) or steady.
da Dan
Hi, Dan
Thanks for looking. The system goes completely down. No LED and no Fans spinning.
da Joachim Ottow