Macbook just stopped connecting to wireless network all of a sudden

Hi,
I was using my macbook on the internet this  morning with no problem.
I then put it to sleep for a couple of hours by closing the lid.
Since then it is no longer connecting to my wireless network.
Message "None of your preferred networks are available".
It keeps prompting me for a password, when I select the network, which all of a sudden is no longer valid.
I know the password is 100% fine as is the router itself (3 other devices currently using it).
Reboot the laptop several times but same thing every time.
The OS X version is 10.6.7.
Anyone else seen this issue?
Cheers.

ross1306 wrote:
Anyone else seen this issue?
All too frequently, I'm sad to say.
Sometimes you can recover by rebooting the MacBook.  Sometimes by rebooting the router. Sometimes by changing the router channel number. Sometimes by renaming the network. Rarely by hurling the MacBook at a wall in frustration.
Bob

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