Windows Xp: Wd Passport - Usb Device Does Not Recognize Device

I bought a wd passport 160gb. And it worked fine i left it running on my computer for 2 weeks and now its not working error (usb device does not recognize device) so i thought i broke it, i went out and bought another one and i am getting the same error with the new one and old one, on mulit computers that it worked on in the past, i even tried in on new computers. Any ideas?

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