Is there a wifi switch on Thinkpad E420 or E520 Edge?

[#1]

Question

All of a sudden my wireless isn't working, after I picked up the laptop.  I'm pretty sure I touched a key or a switch.  Is there a wireless switch someplace on this laptop?  If so, where?

Answer

 There is a shortcut where Fn keys are usually placed.

If you press the wireless control button (which is F9 on my E420), a wireless control UI appears.

It looks like this:

 

From there, you can press either button to turn the wireless feature on or off.

You can also click on 'Individual control' to turn on/off Wireless and Bluetooth separately.

 If previous method did not resolve the problem:

Right click on the Windows wireless control button on your taskbar.

Then, click on Troubleshoot problems.

 A window like this will appear:

Click on "Check to see if this problem is fixed" and wait a while until it turns on the wireless capability.