MacBook with Lion will not recognize external hard drive (AMP) that was my backup for older IBook, please help

I had a IBook G4 and an external hard drive as its back up.
IBook running something like Snow Lepord, anyway
I have a Intel Macbook now with Lion, Ive been told here there is a possible confliction between the AMP external harddrive and lion.
I will say a few times I have for limited time been able to access the drive on the newer MacBook, but then Lion (I think) drops it.
Any ideas out there?

Disk Utility sees the drive, finder/desktop doesnt.
Click on the Desktop->Finder menu->Preferences->General->Show on Desktop->HDs and ext HDs.
Mac OS Extended (journaled) what's that mean and is the format the issue here?
http://support.apple.com/kb/HT1604 and http://support.apple.com/kb/HT2355
No, that's not the issue.

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