SMC/Battery or Logic Board problem? Strange behavior.
I am with a strange problem in my dad's macbook pro mid 2009.
When I boot it with the battery plugged in, it simply doesn't light out the screen backlight. For a moment I thought this could be the WLED chip that blew, but then I unscrew the bottom tamp, removed the battery, unplugged and plugged again the magsafe... voila! It stars again with everything working except the backlight keyboard (funny because in the startup, it blinks).
But then I turn off, plug the battery in and sometimes it starts normally, sometimes not. but certainly on the next day, it gives me the exact same problem and I have to do everything again. Worth saying that if I perform a SMC reset nothing happens.
I am doing it everyday for the past three weeks. I thought it could be a faulty RAM, I changed it and nothing. If I start with the battery plugged in, I can only use the computer with an external monitor "normally".
I think it could be some problem with the SMC, but apparently there's no other version for me to flash.
Can someone please give me any sign of light?
Is this a good question?