Touch screen stopped responding all of a sudden

The other day I was browsing on my Micromax A110Q, I had to go back. As soon as I closed the browser and the phone was locked and, I am unable to get past the lock screen. I tried charging my device, did battery reset with no avail.Tried connecting to PC, still the same. Touch screen not.
Also, I would to put this in to your notice that, I dropped my device twice accidentally. But, everything was perfect until yesterday.