[ubuntu] Cannot re-connect wireless network after I disconnected it

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http://ubuntuforums.org – I disconnected Wireless network from the network drop down menu to test the wired network. Now I cannot find any way of reconnecting Wireless. Symptoms are: Network drop down menu says "Wireless is disabled by hardware switch" SystemSettings/Network/Wireless lists the Wireless MAC address, and says "Wireless Unavailable". It has a virtual on/off switch which shows "OFF". If I try to toggle it to "ON", it drops back to "OFF" as soon as I pull the mouse away from it. The computer does have a hardware switch for wireless which is in the "ON&q (Hardware)