Why cant I enable wireless networking

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http://askubuntu.com – I have just installed 11.10 on an old Lenvo laptop. All the way through the install process the wireless light was lit. As soon as I reboot the light goes out. In network the section to aircraft mode is set to on so I turn this off. I turn on wireless and the indicator light comes on for a second, and then it turns its self off again. Name Lenovo 3000 V200 Processor Intel Core 2 Duo T7300 2GHz Screen 12.1” WXGA RAM 2GB HDD 120GB Optical Drive DVD+-RW,2Layer Graphics Intel Graphics Media Accelerator 965 Network 10/100 Ethernet, Intel 4965 802.11agn Wireless, Bluetooth Other (HowTos)