Cannot access my backup time machine on external hard drive once I changed my hard drive

Since I changed my hard drive on my mac pro book I can't access the time machine back up on my external hard drive. All the shows when I connect the hard drive, but I can't access it.  Any ideas?

I use El Captain MacBook Pro (15-inch mid-2012),

By changing the hard drive, you have also lost all preferences, including those for Time Machine. You can have success by cloning back from the old system to the new drive to get back them.

Or, simply erase the backup drive, reconfigure Time Machine preferences, then let time Machine do a new backup.

Tags: Notebooks

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