How do I get time machine to see my Seagate external drive? I

I continue to have trouble getting the machine to ID an external drive for time machine. I bought a new external, Seagate, installed it and things were fine, until I had to move my computer due to home repairs. I ejected the Seagate as part of the shut down for the move, and when I reconnected everything OS now no longer sees the Seagate.
I have a 2008 Imac with 10.8.4
Current support info does not seem to do the trick. Thanks,

Hello [email protected],
Thank you for the details of the issue you are experiencing with your external hard drive. I found an article with steps you can take when an external device is not being recognized.
I recommend following the steps in the section titled "Top troubleshooting tips" in the following article:
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151
Thank you for using Apple Support Communities.
Best,
Sheila M.

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