After installing Fastboot on my M8 my computer won't read my M8 anymore, how do I fix this?

jazz gill1

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May 9, 2014
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Fastboot M8

Hello everybody,
I was using fastboot with my M8 fine before but I selected revoke USB debugging authorizations and now my computer doesnt read my M8. Because when I go to fastboot on m8 it doesn't do anything. What can I do so my computer reads it again. THanks