Hi guys, the problem is problably in power jack input.. so, I "solved" the problem by first applying pressure to the charger input, if I didn't move it, it worked properly, if it did it would turn off again. Work for a few months then failed again. I sent it to the USA to solve the problem, and Asus technical assistance gave the price of 800 $. A friend of mine said that this problem is kind of common in some Asus notebooks, said he could fix it if I exchanged a 200$ part, but that was not certain, and if the motherboard is of a specific brand (I don't remember the name, sry) would probably fail again after a while. I solved the problem by buying another notebook from another brand =)