It sounds like the issue is with the screen. Unfortunately, replacement screens on the Pro models can be quite expensive so a DIY repair entails you buy the parts upfront without really knowing if it will solve the problem. Check out the repair [guide|110591|guide] here to see what’s in play.
What has happened to the iPad in the days and weeks leading up to this? Was it dropped, repaired or came into contact with water? That may give us some clues.