I can't get my Mac Pro to recognize my external hard drive

I recently purcchased a Mac Pro. I have a 15" PowerBook G4 that I still use. About a year a go I purchased a Lacie 500 GB external hard drive and formated it on my PowerBook and transfered about 350 GB of data over a period of time. I know am trying to access the Lacie on Mac Pro and the disk will not mount. I know that you have to format external drives differenly for Intel Macs but is there a way for me to access my data on my Lacie?
Please help! I need these files.
Mac Pro Mac OS X (10.4.9) Dual Core 3.0 Ghz, 4 GB memory

Intel Macs use a different partition table format (GUID) for booting. Otherwise, the PPC/APL tables should still let it mount etc unless there is a problem with LaCie or the FireWire ports.
Does it have FW800/400 and USB2?
Seems like LaCie isn't using the best cases or firmware or bridge.
This is a D2 model? two drives bridged to appear as one volume?

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I just purchased a Hitachi external hard drive to back up my PowerBook G4--Mac OS X v 10.5.8 (1.67 GHz PowerPC G4 processor). The computer will not recognize the device. I have reformatted it via another mac and it still will not be recognized. It is plugged in via USP port and the device does light up but it never blinked. I have gone to Finder and it is not listed. I have go to Disk Utilities and it is not listed. HELP!
I have tested the USP ports and other devices (flash drives, printers) work.
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Hello,
You say you formatted it using another Mac, which Mac would this be and what did you format the drive to?
I wonder if the device is USB 3.0 only and as a PowerBook has only USB 2.0 port it's just not recogniszing it.
I have also know the leads to be at fault in the past. I have an external drive that simply wont work on my PowerBook using the USB lead it came with, but a longer older lead it works fine. On My MacBook it works fine with both leads (Strange) So you may wish to try another USB lead.
Is the external drive powered from the USB port or does it have an external power adapter?
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All the above are possibilities.

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You are probably using Time Machine to backup your MacBook Pro, right? Then the additional 300 GB could be local Time Machine snapshots. Time Machine will write the hourly backups to the free space on your hard disk, if the backup drive is temporarily not connected. You do not see these local backups in the Finder, and MacOS will delete them, when you make a regular backup to Time Machine, or when you need the space for other data.
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You may have already done these resets in the "tried all I can think of " portion of your post.....if not then here they are.....
PRAM
support.apple.com/kb/HT1379
SMC
support.apple.com/kb/HT3964
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