My laptop is a lenovo y50 running windows 8.1 SL.I recently had to replace the display frame on my system...after i got it back i havent been able to connect to my home wifi or other wifi networks... i tried connecting the ethernet cable but with no luck..i need to activate my windows so i need an internet connection...ive checked every basic stuff.my mobile and my desktop is connected to this same network without any problem.even though connection is established when i try to access the internet it says that i dont have internet connection..pls help