External Hard Drive is not being detected

I recently purchased an iomega 1.5TB external hard drive and I cannot detect it anywhere in my computer. I can hear the device hum and start running once I connect the two, so I'm assuming there is enough power, but the computer can't see it. Please help someone!

Does it appear in Disk Utility?
Have you tried FINDER PREFERENCES>GENERAL and checked off the appropriate boxes?
Ciao.

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