How to solve htc pro 2 blank screen problem?

I was also facing the same issue but was able to fix it myself that too free of cost. It is a common problem for those who carry their phones in their pocket instead of the holster. What happens is, the debris gets stuck around the edges of the screen and stops responding to the touch. All you have to do is slide your fingernail along the edges of the screen which is almost like you are going to peel out the screen off to get the debris out from its under the edges of the screen.

The info will definitely help you.