MacBook Pro A1151 Power on Problem
I have a macbook pro a1151 that will not power on when i press the power button. When I do this, I get a momentary flash of the power light on the front, and a wheeze of the sound of the HD trying to start up. The machine then fails to power on. I have power from the power adapter and its charging the battery. The green light is on.
However, when I hold the power button for several seconds, I get repeated flashing of the power light on the front of the macbook, and it is followed by a long chime, and then the macbook boots without issue.
I have tried the following to resolve.
Replaced the HD
After reading some of the other answers to questions of a similar nature, could it be possible that the problem lies with the I/O board and not the logic board? What tests can I do to the I/O board to check if there is a fault and what is the likely hood that replacing the I/O will resolve this issue?
Is this a good question?