Internet iMac & MBP

My internet connection my iMac was working fine, but all of a sudden it lost the connection, I tried removing the connection and entering the WEP key again, but no solution. The strange thing is that my MBP works fine, same internet connection and same WEP key? What the **** is going on here? The **** is supposed to say H E L L not the other word that starts with an the other what the F***!!