My 2010 imac does not recognise my time machine since I had the Seagate replacement hard drive. Any thought from anyone? The External hard drive is a 1 TB seagate

My iMac (2010 intel model) does not recognise or communicate with my external seagate drive as a time machine for back ups since I had the 1TB Seagate replacement hard drive as part of the replacement prgram with OSX LION 10.5.8 installed.
Is this because I need to update the time machine drive itself?

This excellent Support article may help you solve that TM problem:
       http://pondini.org/TM/Troubleshooting.html

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