I just plugged in a jumpdrive. When I go to my computer it does not show up, why?

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We're going to need more details in order to try and help you.
What is your operating system? (Windows XP, 98, ME, etc)
What is the brand of jumpdrive you are using?
Do other USB devices work? (assuming you have tried some)

This info will be crucial to finding an answer.
WallyH