Western Digital 120 External Won't Mount


I have the subject external hard drive with both Firewire and USB 2.0. A few weeks ago the power cord came loose while the drive was booting up and now my computer (or any computer [pc or mac]) won't recognize it. I've tried DiskWarrior and Data Rescue but nothing works. Strangely enough, nothing is recognized through the USB port, but sometimes I get a reading from the Firewire Port. Strangely enough, Data Rescue recognizes a 2 Terabyte hard drive but doesn't see any info. When I plug it in to my computer (a Powerbook 15-inch, 1.67) the lights on the drive go on, but nothing else. The drive doesn't seem to make any noise, not even the "click of death". I'm running Tiger OSX.
thanks in advance,