MESSAGE "Checking media (fail)" ON BOOT & wifi not working 

1. Reboot the computer and go into boot mode (press F2) at startup. Then move over to the boot tab and select the UEFI boot. There you should see a list of these three items:

Windows Boot Manager
UEFI Onboard LAN IPv4
UEFI Onboard LAN IPv6

It allows you to change the order and in my case I had to change it to the order shown above before the message stopped appearing. 

2. First make sure that your wireless connection is not disabled. 

Click on Start --> In search box, type ncpa.cpl and press Enter 

"Network Connections" window will be opened. If you find your wireless 

connection icon in grey color then right-click on it and select "Enable". 

3. Check your SSID and the security key.