External Drive (OWC AL PRO) won't mount on on new iMac but mounts on my old macs HELP!

I have an OWP Mecury Elite AL PRO 4 TB external hard drive that mounts up on my friend's iMac (running snow leopard) and on my friend's macbook pro using firewire 800...
I just purchased a new iMac that came shipped with Lion.  It will not mount up using firewire 800.  My iMac doesn't have firewire 400 ports so I am unable to test it that way.  Any suggestions?  I called OWC and they had no solutions for me....

You've probably already tried this but have you checked this box in Finder Prefs?

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