I have just gotten my MBP from a guy who had it for a month. So it is basically brand new.
I tried to hook up to my wireless network at home and it does not work. All my other computers which are all PCs connect just fine. But this mac cannot connect to it. The notebook sees the network but I cannot connect to it.

I have tried to make the network unprotected. I was still not able to connect to it.

Can some one help me please?

thank you