When I enter Time Machine nothing is there

08-17  Source: Network gathering  Views:3 

I need to restore something but when I pick my date the files are all black.  As if nothing is there. Is it possible?
Somebody cleaned my HD and transferred all to external drive. When he reinstalled, a bunch of  Apple apps were missing inc iPhoto, Garage Band, iWork's etc.When I go back to an earlier TM date, black. Could it be he erased my TM too?
Take a look at Migration Assistant on your Mac to check if it might be able to see the backups that Time Machine cannot.
Finder > Applications > Utilities > Migration Assistant.
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