Surface pro 3 - Key board not working and back light keeps flashing

Hi

I have a surface pro 3, suddenly the type cover key board stopped working, I tried all the solutions in the internet, volume up and power button, brushed the magnets underneath, filter keys and updated the drivers as well, but nothing works, But one unique thing that is happening in the keyboard is, The back light keeps flashing non stop when i connect it with the surface pro, even when its turned off. Any help is appreciated.

Thanks

SP