Problem with old external hard drive

[klmclavy]

I have an old external hard drive (5yrs) that I used on a G4. I tried to plug it into my 10.5.8 and it will not register. I tried it on 3 different computers.
I am tiring to use it for work (school teacher). I have an older Mac at work that it did show up on so I can get the info off. How do I get it to work on my newer one? I have no disk for it.
I am also sending this problem to the company.

 

[spinnerlys]

What model of external HDD do you have and how does it connect to the Mac (USB or Firewire)?
Does it show up in Disk Utility on the Leopard Mac?

What about getting a new HDD and copying the data fro the old to the nwe while connected to the G4?