My Book Firewire External Causing iMac to not shutdown

I have several external devices connected to my iMac.
1. My Book Firewire External HD
2. My Book USB External HD
3. USB Hub for mouse, keyboard, USB connection for M-Audio keyboard
4. Presonus 1394 Firewire Audio Interface
My iMac does not want to shutdown all of a sudden and I have traced it down to trouble with the My Book Firewire External HD. For some reason, when I Shut Down the iMac, when it does shut down, the My Book remains running even with the iMac off. I have to unplug the My Book to turn it off. Any ideas on why the My Book is causing trouble with my iMac and why it will not dismount when I try to dismount it via Finder?

The software I was referring to is the Button Manager software which now that I look at it may not have anything to do with the auto power down nor have I even tried it. Just thought I would through out some ideas.
http://support.wdc.com/download/?cxml=n&pid=999&swid=56
You could try resetting your SMC: http://docs.info.apple.com/article.html?artnum=303446

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