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This question already has an answer here:

I have accidentally deleted the system files from my NXT 2.0. It is making a continuous clicking sound. How to I restore system files. I have the system files, but my computer can't detect it!

Please help soon!

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marked as duplicate by Joubarc Sep 19 '13 at 4:10

This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.

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You need to reload the firmware. If you use NXT-G, this can be found under the Tools->Update Firmware menu.

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