Just contact PP support directly and see what they can do for you. If it's dead and there's nothing they can do, I'd suggest looking for a Seagate Dockstar on Ebay. They are exactly the same as your PP (you can still use my.pogoplug.com, same desktop software, etc.) plus give you WFS so you don't need to install the PP software on workstations on your LAN. They can be had for around $15 on ebay, just hook up your USB HDD and you're back in business.

Death is Conquered While You Slumber- Seven is the Perfect Number