By this way I have got on you very big request. I am so sad of following situation. I bought a new macbook air 11 2012 on 17.8.2012. After that I wen to holiday for 2weeks. When I came back I found out that one key on the keyboard is broken. I called to seller where I bought it an tried to convince them to refund my macbook air for the new one. The did not agree and told me that I should take it to apple service. I did not want to bring it to repair department. But I had no choice. I knew it I did not do it. After 3 days they changed whole keyboard case for the new one. Today I brang my air to home and tried to connect to internet as usual with wifi. It connected but the speed is so poor. I tried it by my friend and in free wifi restaurant in our town- the result the speed of connection is too poor What can I gonna do? I tought they only changed the keyboard. But it seems there is new problem. Is there any solution how can I fixe it at home? just some settings could be help? format? recovery? I tried command + alt + p + r on start up. but did not help. Please. Give me an advice I am totally sad of apple services thank you very much.