T420 Wifi Led light not turned on

I have a lenovo t420, and I notice that my WiFI led light on the bottom of the LCD panel is not lighted when i have my wireless on... My bluetooth led light works fine. I tried to switch both my Lenovo Access Connection and the switch button but nothing works? any idea ?

Maybe this will help. Page 96 or so, maybe other pages as well.
Hardware Maintenance Manual - ThinkPad T420 and T420i
Z.
The large print: please read the Community Participation Rules before posting. Include as much information as possible: model, machine type, operating system, and a descriptive subject line. Do not include personal information: serial number, telephone number, email address, etc. The fine print: I do not work for, nor do I speak for Lenovo. Unsolicited private messages will be ignored. ... GeezBlog
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