When I "Enter Time Machine," nothing happens.  Is there some way to fix this?

11-30  Source: Network gathering  Views:0 

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I wanted to replace a file with an older version, and when I tried to enter Time Machine from the menu bar, nothing happened.  I restarted the computer and tried it again and still nothing.
I have a MacBook Pro with OS 10.7.5.  
Thanks,
Erik Jurado
This excellent support article may help you with that:
                     http://pondini.org/TM/Troubleshooting.html
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