Either the switch is not making proper contact OR the software driver has failed OR the network hardware on the motherboard has failed. Have you run the operating system diagnositic on the laptop? That is where I would begin. I assume you are running Windows so open Control Panel -> Device Manager ->Network Adapters->Look for a wireless device->right click mouse & select Properties->
It will tell you whether the network device is working properly or not and whether the driver is functioning properly. If it says all is well then it is likely the switch. Otherwise you can update the driver. However, if there is a hardware error you can assume that your adapter on the mainboard has failed. If the switch is bad or the mainboard has failed then it will have to go in for replacement. You can only run diagnostics and update the driver for the most part as a user. Hope this helps.
You must turn the case switch on and use Fn+F5. See the manual at... http://mobilesupport.lenovo.com/us/en/products/laptops-and-netbooks/ideapad-s-series-netbooks/ideapad-s10-3
SOURCE: WiFi Keeps connection keeps switching off.
go to my computer propetes then go to hardware then device manager then network adapter enable if it is disabled
SOURCE: bluetooth/wifi doesnt works
Same problem occured at HP laptops. Unfortunate, problem comes from the board. Somewhere has got crack or broken link. Last time I have checked, I find , Top of the board and bottom of the board has got copper lines and devices soldered, but there is also middle lines that not possible to access and repair without shematic diagram. I end up changing the board that solve the problem. But Before that I install driver, restore again (seems worked forawhile) remove the wireless card check solders, setup network again. None worked. I do not want to give you bad feelings but, if it is Vista, reload the drivers and see if will work.
Hopefully it will. Do not touch the switch much, there are P.O.S. Small spring inside the switch is loose everytime and it is not gold plated, get rusty couple of months. Goodluck
JMC
SOURCE: I have a Lenovo Y430 notebook and it was working
After making sure that the status of network adapters in the device manager showed enabled, I tried using the Fn+F5 key on my keypad. The Fn+F5 key showed my WiFi status as disabled inspite of the Wifi toggle switch on the front of the laptop in the "on" position. So I enabled it and the WiFi led started glowing and I was able to access the internet through WiFi connection
SOURCE: Reg: WIFI drivers not getting installed
You need to check first if the wireless switch is turn on.If it is on, check the function key for the wireless. Some computers have function key. Sometimes it is combination of fn and f5. Press those keys at the same time and you should see a pop up window and check if the current status is on. If it is on, uninstall/reinstall the wireless driver in device manager. go to programs and features and look for lenovo readycom, uninstall the software and restart your computer. If this didn't work. You need to do re installation of your operating system.
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