Volume keys on keyboard not working windows 8 laptop

I have a windows toshiba laptop and i dont know what happened but my volume keys and all the keys at the top like brightness up and down and airplane mode stopped working. I installed all the updates toshiba gave me for but nothings happened. My Toshiba Satellite C6functions keys are working, but as you know, other secondary functions are also associated to function keys, like changing the brightness, volue, wifi etc. These secondary functions are not working in my laptop. Fn key to change the volume.

It is acting like there is a Fn lock on or something. OS in laptop and recently control keys have stopped working all of a sudden. Both the keys are not working.

My keyboard volume controls suddenly stopped working - Microsoft

Windows or Windows device? I did and I realized I could not answer this question. Therefore I've done my best to identify all the methods that can be used to change the volume, without installing any third party apps.

I faced something weird that put down a question mark on functioning of shortcut keys on my keyboard. Actually, when I hit the volume (including up and down) and mute keys on keyboar there seems to happen nothing. Microsoft recently released Windows an upgrade to Windows which arrived with mixed reviews.