Problem connecting to external harddrive

I've read loads of threads all over the internet about people having similar problems to me but so far I am yet to find any answers or a solution to my problem!
I've got a new macbook pro 13" running Snow Leopard 10.6.2. I am trying to connect it to my external hard drive, a Freecom Hard Drive Pro 500GB using firewire. So far finder has not been picking it up and neither has disk utility, yet system profiler still recognises it when I select the firewire tab, it just doesnt seem to want to mount. I have also tried using usb to connect the drive and this isn't working either.
I previously used this drive with my iMac G5 and that was when the problem started so I'm guessing that it is a problem with my drive instead? I have a complete backup on my external drive of my imac, plus around 100 movies and a approx 100gb of music and loads of applications so I'm hoping I can save these and get my drive to mount with out reformatting or anything...
Can anyone give me a hand in fixing my problem?
Many thanks

What does System profiler actually "see" under the firewire tab, Ed?
If all is well with the drive then it should show the bridge in the enclosure, and then, indented beneath this, information about the drive itself (Capacity, the fact that it is removable, its BSD name, partition Map Type, etc) and then, indented again, the name of any volume or volumes on the drive, available free space on the volume, Whether it is writable, the File System in use on it, BSD name and Mount Point.
If it only shows the bridge in the enclosure, but not the drive itself, then either the bridge is faulty, or the HD itself is faulty, or the two are not properly connected to each other inside the enclosure, or the drive is not receiving sufficient power to run.
Cheers
Rod

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