Try removing the battery and pushing power button to discharge capacitance.
Check to make sure phone powers up and battery is good.
Purchase new touch screen.
http://shop.ebay.com/p1i%20screen?_from=R40&_trksid=m38&_nkw=p1i+screen&_naf=1
Repair.
http://www.formymobile.co.uk/p1disassembly.php
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