2 firewire hard drives stop mounting after attempting to install dvd burner

Hi....Im really at a loss here....I have 2 200gig firewire hard drives connected to my G4 tower which mounted and worked without a hitch until I tried to install a Lacie firewire dvd burner....now neither of the drives mount or even show up in dik utility on the tower or my powerbook....is there something I could do here?...lol...I dont even know where to start...and to top it off I couldnt get the burner to work on the tower or the powerbook....lol...my whole digital world is screwed right now....thx for reading my disaster story.

Ok this didnt work....I then tried these drives on a friends ibook (which mounted them b4) and same result...Does anybody know where I can get firmware or drivers? Or have a suggestion? anything would be good help thanks.
Jeff
The drives in question:
PM-350F2-M0S Glowie Firewire 3.5 External + Maxtor 200GB 7200RPM 8MB Hard Drive
ME720 3.5 Compact External Firewire + Maxtor DiamondMax Plus 9 200GB 7200RPM 8MB

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