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Under Mint 12 on an HP Pavillion DV7, my wireless stopped working

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http://unix.stackexchange.com – My wireless worked when I first installed. I needed to turn it off for a while, so I clicked "off" in the pulldown dialog. I used the wired network for awhile, but when I went to turn my wireless back on, it started connecting for half a second then dropping the connection. I can use the wired interface but my office doesnt have a wire so I have to go out into a common room to work. Very irritating. Can anyone help me? Note that this isn't the same problem as this, as he never had wireless afaict. Maybe it is and I don't understand something. UPDATE: The device is a Atheros AR5B91, and (HowTos)