MacBook suddenly saying invalid password for wireless

I have a wireless network with an airport extreme and an airport express for streaming music.
My computer has been connecting to my network without problems for the past two years, and I have not changed a thing.
Suddenly my music stopped playing and iTunes said it could not find the airport express. At this point, I was still connected to the wireless and it was working fine. I tried restarting everything, but now when the computer tries to connect to the wireless, it says invalid password. It is not. My iPhone can connect to the wireless just fine, so I know it is the computer.
When I take an ethernet cord and plug it in my computer it can miraculously connect to the wireless. When I unplug it, it stays connected until I turn my computer off, and then it's invalid password all over again.
I've tried deleting the keychain and resetting the pram. I don't understand what caused this problem.
Help!

Exact same problem. iPhone and ITouch connects but my macpro and Imac could not connect to my airport. My imac connected about 10 min ago but the macpro is still saying invalid password. Have you located a solution?

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