Wireless adapter turned off, wont enable

Hi, I got this Lenovo x201 AC4 yesterday. I installed Ubuntu 11.04, used the wireless till today morning. But then suddenly the wireless icon with LED turned off and wont turn on again and I cannot access any network right now.
Tried restarting, but no help.
It got disabled when the laptop was running on battery battery power.
I saw another similar thread, but the questioneer was using Windows. As the wireless adapter is turned off, I cannot even find and re-enable it from inside ubuntu.
Any help?
Update: The wifi led doesnt blink at the time of POST. The bluetooth one does.

I am not sure if I can really help you (I do not have a x201), but since no one else answered yet. I try to give some advices.
The most easiest way to activate the Wireless adapter on Ubuntu is on the right upper corner of your desktop in the wireless menu. but i assume that did not function.
A second method to enable Wireless is to activate it with the key combination Fn+F5, by pressing multiple times you activate and deactivate wireless and bluetooth. Pressing once activates Wireless.
there is also the possibility you deactivated wireless by switching the button on the left side just right from your yellow usb-port. Thats a hardware switch for your wireless, when turned of there is no possibility to activate wireless unless you switch it from red position to green position.
sorry thats all, if there is a driver problem i can not help...

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Initially, I am able to connect to any wireless network without a problem. However, after about 2 minutes of not actively using the internet, the green "wireless radio" status light on the front panel turns off and I lose my internet connection. I then have to do "Fn + F5" (or ThinkVantage button -> Manage My Connections -> Power On/Off Wireless Radios) to turn it back on (and get the status light to be green again). I then have to reconnect to the wireless network.
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Hi there @MUKESHCP,
Welcome to the HP Support Forums! It is a great place to find the help you need, both from other users, HP experts and other support personnel.
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Wireless adapter turned off, wont enable

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