i have mid 2011 iMac. it will connect to the internet but only for like 15 seconds then after that it disconnects. i have a iPad, iPhone and Chromebook at arms reach and they are all connected to the same wifi and no issues there. so i know its the iMac. i have restarted the computer, i have removed the and added the network back, i went into the keychain and removed the airport password too and still not able to get a stable connection. before i get this answer "take it to a apple store" i live in west virignia and god forbid apple build a store here.