MBP 15" Unibody wont boot, powers off before start up sequence.
My MBP 15" Unibody from okt 2008 started acting up again.
I press the power button, the power light lights up for 3 seconds and the optical drive makes it's typical startup noise... But after 3 seconds it just quits, completely powers off.
After maybe 7 seconds the power turns on again, the Power light turns on but nothing more happens. I have to force quit by holding the power button for a couple of seconds to turn it off.
No software has a chance to execute, I can't do any commands nor does the screen light up at all. This happens all before the apple chime.
I've taken the battery out (full charge) and unplugged it, exchanged it for a new spare one, pmu reset, exchanged the hard drive, tested the existing hard drive on another mac without any problems, tested the ram modules (out completely, and single ones mounted.)...
Is it a logical board issue or what can it be? Why does this happen again? (see below)
Prior issues has been a faulty super drive exchanged in mid 2009 within warranty. Then an issue with a swollen battery where they exchanged the hard drive, the hdd cables, the super drive, and the logic board even if the warranty had run out.
Serial no XXXXXXXZ1GA
Is this a good question?