New internal hard drive and now cannot migrate from back up

Took my MacBook Pro in yesterday to have it looked and found out hard drive was failing. Had already backed up via Time Machine onto my iomega external drive before I took my laptop to Apple store. I have been backing up for several years to the iomega drive. Got my MacBook Pro back today, and brought it home--awesome work by Apple store, even had it done yesterday before I made it back home from dropping it off.

So, here is the deal, turned it on, went through the steps required and got to the migration part. It recognizes that my iomega drive is connected to the laptop as the icon is on my desktop. However, the migration assistance cannot find the drive and just keeps spinning. Any suggestions before I set up another genius bar appointment?

Thanks

Michael