[ubuntu] Wireless suddenly stopped working?

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http://ubuntuforums.org – This is a weird one. After a lot of early trouble I finally got wireless working fine on my laptop setup, I've solved all the other problems with ubuntu too. It was all going fine. Now though, I turn it on and wireless just doesn't work. I click on networks up at the top towards the right and enable wireless isn't ticked and its greyed out so I cannot tick it. ANy clue what could be up? (HowTos)