Hi,
Based from the user manual of your laptop it should be fn+F12 to enable/disable your wifi adapter. If it doesn't work do try these troubleshooting steps that may help.
- Start by uninstalling /reinstalling the latest wifi adapter.
- Go to Device Manager and uninstall the Wireless Adapter driver.
- Next is to download and install the latest driver from the manufacturers site.
- Once done reboot your laptop for all the changes to take effect.
- After the reboot do test it again if it will connect wireless.