My external hard drive is not detected through my Thunderbolt port. How can I fix this?

I just purchard a Seagate GoFlex Portable Adapter for Thunderbolt. I have an internal drive from an old computer that I wanted to access information on. My hard disk is not detected on the disk utility nor can i hear the hard drive  turn on and "hum" eventhough the adapter is connected.
Thanks for any help provided.
Items:
Seagate GoFlex Mac Portable Adapter for Thunderbolt and Thunderbolt Cable
http://www.seagate.com/external-hard-drives/portable-hard-drives/performance/gof lex-for-mac-thunderbolt/
Seagate 200GB Internal Hard drive

Here you go
Intel-based Macs: Resetting the System Management Controller (SMC)

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