Have you tried the hot key? The hot key for this machine is F3 and the function key, which is the key with the windows on it between ctrl and alt. This turns your wifi on and off and puts you into airplane mode. If you accidentally did this than it can turn your wifi off. There is also a possibility that you lost the drivers, if the airplane mode wont turn it on and off, then you should reinstall the drivers for the nic. This is done by https://www.youtube.com/watch?v=f73w1jJdX5g this is a good tutorial to help you out! Hope this helps~! Good luck!