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Aktuelle Version von: Jurgen ,

Titel:

Goes part way into boot up, then shuts down

Text:

So when it responds to pressing the power button at all, (it not always does) then it will chime, light up, go to Apple logo, progress bar about 1/3 of the way and shut down. I tried another known good battery which helped it boot up instead of just acting dead. It has a light on the mag. It does not respond to SMC reset, it will just boot 1/3 of the way…It does not comply with PRAM reset, ignores it, same with Com/S etc . I disconnected various peripherals, such battery indicator, DVD drive still no cigar. I also tried booting of external known good SSD, in case the SATA connector was damaged: same 1/3 boot. So the bug is in the pre OS loading aspect. This is not the first time I have come across such a machine, and really would like to find out where to look and what is the most likely culprit. …Any pointers from the gurus would be much appreciated. I have not tried another RAM chip yet, but will here shortly. Cheers, J

Gerät:

MacBook Pro 17" Unibody

Status:

open

Akzeptierte Antwort:

658891

Ursprünglicher Beitrag von: Jurgen ,

Titel:

Goes part way into boot up, then shuts down

Text:

So when it responds to pressing the power button at all, (it not always does) then it will chime, light up, go to Apple logo, progress bar about 1/3 of the way and shut down. I tried another known good battery which helped it boot up instead of just acting dead. It has a light on the mag. It does not respond to SMC reset, it will just boot 1/3 of the way…It does not comply with PRAM reset, ignores it, same with Com/S etc . I disconnected various peripherals, such battery indicator, DVD drive still no cigar. I also tried booting of external known good SSD, in case the SATA connector was damaged: same 1/3 boot. So the bug is in the pre OS loading aspect. This is not the first time I have come across such a machine, and really would like to find out where to look and what is the most likely culprit. …Any pointers from the gurus would be much appreciated. I have not tried another RAM chip yet, but will here shortly. Cheers, J

Gerät:

MacBook Pro 17" Unibody

Status:

open