I have two LaCie 250gb external firewire hard drives. Both spin up when power is applied but neither show up on the Desktop of my iMac G5. I have tried with two different firewire cables. Referring to the Internet, it seems that many people have the same trouble with external hard drives. This doesn't add up to me. What is so difficult? Should be a simple plug and play situation. Meanwhile, as neither drive is recognised, I am unable to apply any testing or updating to them. Seems like a lost cause. iMac 20" G5, 2gb RAM, 250gb HDD.