PPC Help

Help, my PPC (TyTN II) is not being detected on my computer or any other computer. I've tried 2 PC's and 1 Laptop all using Win XP SP2.

It worked fine till a few weeks ago, when I plugged it in and suddenly it said USB Device Not Recognized. I've tried looking for help everywhere, but no one seems to know what the problem is. I don't think the pins on my phone is damaged cause everything else works like earphones, charger, it even charges when I plug it onto my PC. I've tried restarting phone and computer, using front and back USB ports.