IMac suddenly can't connect to wireless!

My iMac suddenly refuses to connect to wireless! It worked fine before.
Tried everything including resetting the wireless router.
It always said that my password is invalid... My password is correct!
Can anybody help me? Thanks!

I'm having the same problem.  I have a time machine that I use for my wireless router.  I connect wirelessly using my Macbook Air.  It has worked fine for months.  Today, about 4 hours ago, my wireless connection stopped working.  When I connect via ethernet directly, it works.  I know it's not my router, because I also tried a spare Airport Express and that doesn't work either.  I'm going to try restoring the time machine to its factory settings and configure it from scratch to see if that works.  I'll post back with the results.

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