[ubuntu] Failed wifi connection to internet

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http://ubuntuforums.org – Ubuntu 12.10 and Windows 7 on HP Pavilion Notebook, was connecting for many months without fault to BigPond via wifi, Bigpond Technicolor TG587N modem, now reports Bigpond 937C63 is available (normal) but will not connect, just keeps asking for password. Win 7 on same machine working without fault. Have tried connecting to Linux Mint running from DVD, same problem No alterations to original settings have been made to cause this problem. Any ideas.?. It appears to be a software problem, but where and what.?. Incidentally another laptop with Ubuntu 12.04 connects without fault. (Hardware)