First of all, my apologies if i make alot of gramar/spell errors, english is not my native language. Yesterday i've upgraded my Snow Leopard installation to Lion on my late 2008 macbook pro and from the beginning i am unable to start my Wifi/Airport card. The menu bar shows the wifi icon but with no signal bars. When i click the wifi icon and press 'Turn wifi on' nothing happens. System profiler shows the airport card and when i look in Console i can see that the system recognizes the wifi card and acknowledge it's mac address. What i've tried so far: - I've created another user account - I performed a clean install on a second harddrive, same problem - i rolled back to Snow Leopard and the airport card functions as it should be, this rules out a hardware failure - I've deleted all files in /library/preferences/SystemConfiguration and rebooted - Deleted all airport related files in /Library/Preferences/ - Deleted all airport related files in my user library - Did a permissions scan and fix with disk utility - Verified my disk with disk utility - I've created a new location with only the Airport card under System preferences - Network - I've made the airport card inactive and active again - Reset SMC, PRAM and NVRAM - Deleted /Library/Preferences/com.apple.alf.plist and rebooted - Changed my ipv6 settings to link local I did found some strange messages in Console but they are not very clear: http://imageshack.us/photo/my-images/718/screenshot20110721at102.png/ I've found out that Lion updates the firmware of the Airport card and the Airport utility so i think it has to do with that. I have a Broadcom BCM43 Airport Extreme (0x14E4, 0x88D) card. I don't have AVAST software or a firewall running but even if i did, that won't cause this kind of issues. Apple really needs to fix this, i can't work without wifi.