Ursprünglicher Beitrag von: Beach Fixer ,
I understand this is an older thread, but I just had one of these in my shop for no power and no light on the magsafe charger. My customer to it to a local Mac retailer (no Apple store in immediate area) and they wanted $450 to send it to Apple just for diagnosis!!! I was able to determine that the mainboard has some slight liquid damage to it. Toward the rear of the laptop an unused pop connector had slight corrosion on a couple of the leads. A few shots of QD Electronic Cleaner and slight scrubbing with a toothbrush to remove the corrosion was all it took to return the laptop to a working state.