ok something weird happened to me too....DO NOT PLACE AN UN-CASED P2 in pockets or backpacks get leather cases with front covers if possible.
I already posted this in another thread but try it. I put mine in my pocket (with no case) and found something weird with the screen when I brought it back out. The touch screen was touching the screen at the center making it seem like there was a droplet of water in between. I pressed the sides (see diagram) and with a pop it separated. Do not press too hard as to crack the touch screen.
If that doesn't work try a reset. You do this when you replace the screen so the p2 can calibrate the screen. If you don't then the screen will not work. The reset is at the back. press it or keep it pressed...there are steps on hard resetting it in another thread