My iMac running lion will not sleep if an external HDD is connected.

My Imac will not sleep if the external HDD is connected. This just began to occur. If I unplug the drive it goes to sleep. This doesn't happen with any oter USB pereferals.
Thanks in advance.

From the menu bar, select
 ▹ System Preferences... ▹ Network
Click the Assist me button and select Assistant. Follow the prompts. How far do you get?

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