The Mini uses IR touch. That means there are IR beams across the screen. The most common cause for problems is muck getting caught under the bezel and blocking the beams.
The next most common reason is not reassembling them properly after pulling one apart for some reason. I have done this a couple of time. Though worst is when you try to test it while it is apart and it takes five minutes to remember...
If it has been dropped, something could have been knocked out of place. Check that the bezel is sitting properly on the screen with not gaps. Simply squeezing down on the bezel might be enough to solve this.
You might want to open the back and check everything is in place. I don't have a Mini so I don't know exactly what is there to check.
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