Reformating external hard drive for use with new MacBook Pro

I'm trying to figure out how to use an existing external hard drive (formatted for a Powermac G4) with my new MacBook Pro. I understand that the file formats are different and that I need to erase the hard drive and reformat it with a GUID partition, but how does one do that?
I've already erased the drive with disk utility (using the old Powermac) and connected it to my MacBook with the hope that it would be recognized. No dice, alas. It doesn't mount at all.
Any suggestions on how to proceed would be greatly appreciated. Thanks!

My external harddrives all work just fine with the MacBook Pro. You shouldn't have to reformat anything. I think if you did then it would not be backwards compatable with the older systems. Stick it back in your old computer and try to mount it again, repair permissions shutdown your macbook pro and connect the external drive then reboot

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