Logic Board failure

Could be anything. Water damage, overheating, chip burning out, solder melting, short circuit, act of God.. etc

 

Like anything electronic, sometimes things just fail. There's not necessarily any specific reason, it just happens from time to time.

 

My logic board failed last year. Genuis at the Apple Store couldn't give the exact reason why. Luckily, this happened a week before my AppleCare was going to expire.

I asked the Genuis how much parts and labor would have costed had it not been for AppleCare, and if I remember correctly, the price was around $700.

 

There is always a specific reason. It might come without warning and may not be linked to how the used used the machine, and may not be able to be understood or resolved, but there is a reason it doesn't work anymore.

 

Well, eventually over time, capacitors stop being able to hold and regulate power, chips can become de-sodered from heat, and circuits can wear and "brown out" due to dirty power. This is about all I can think of off the top of my head.