Solved Function F4 Switch Of Wireless on Advent Monza T200 Laptop

I can’t switch the wifi on network and Internet. The button simply won’t stick. Then I tried the shortcut function+f4 and my laptop says “no function”. Just as info: I didn’t do anything to my laptop, switched it off yesterday as usual then when I switched it on today it wouldn’t connect. I tried everything and I know it’s the wifi button. Restarting nor restoring didn’t work (restoring was not possible and it might have been to do with it?!). I suspect I may have placed something on the keyboard which triggered something. Can anyone help? Please! Emi