Hi Andy,
thanks for your time.
I tried just having the AC adapter and battery removed + holding the power button. When I do that, the mac try then to start (without sucess) but the fan are blowing at maximum speed for 3 seconds and then switching off.
The power button is working. I also tried to start the mac without keyboard but directly by shorting the two contacts on the logic board. The mac also tried to start and shut down (the fan are blowing only 3 seconds).
The 2 fuses seems ok, I checked with controller.
I am more and more afraid that the logic board is gone away.
The full story is that I was working on a document thursday morning, then I moved home and wanted to continue to work but the mac did nt manage to get awake ... I forced a shutdown (pwr button for some seconds) and voila !
I check the voltage on the cable from the left I/O to the motherboard : around 12.5 V. Is this ok ?
I don't know anymore what and where to look for. Any idea ?
Regards.