ThiagoAndre,
A warm welcome to Mac-Forums and thank you for your post.
We understand your frustration. Here you come to a Forum expecting a speedy reply and a solution to boot.
The problem is - we weren't sitting next to you watching your every move. You need to help us by starting at the beginning and taking us through every step you've made.
So: let's start with your setup. Which Mac, Model, Year and Operating System (OS)? Any other hardware we should know about?
Then, what have you done so far? - take us through every step. Sweep away our ignorance. Take us into your confidence and then, we can start to help you. And help you we shall till a solution is found, if that is possible.
Ian