I had to disconnect my My Book USB to G5, firewire to external hard drive

Question

I had this hard drive formated journaled whatever was recommended and it has been used to drag all photos off my full G5 internal drive which has only a 80GB hard drive. I have added a second internal drive and have successfully formated it and it shows up on desktop. I reconnected another Maxtor 40GB HD and it showed up when i reconnected power to computer after moving desks around for construction.
Now the 360MY Book external hard drive after connecting power and firewire and usb to G5 does not show up on hard drive. I was using this partioned. On part for backing up with SuperDuper. It does not show up on hard drive. I should have bought a full firewire 500 for photos but this was on sale. I had to write to this forum before. Turning off power, disconnecting the MYBOOK and turning off the computer by shutting down did not work for me. I think as I recall someone wrote to on restarting the G5 holding down two keys like command something C or D or whatever. I have tried various reboots and unconnects and cannot get my backup system working nor access 90 % of my photo collection as I dragged them to a folder on the external drive as recommended to free up space on internal drive. I am back to only 14 GB space on my primary. Please help. I paid twice for home consultants and got burnt both times. Neither guy helped me set up a system of photoshop files on my external drive or recovered my lost files which should have been in .Mac backup on my La Cie or on MYbook in Super Duper. Why do consultants get to charge by hour $100 without results??????? sad switcher.Pcs recognize external drives and don;t lose IPHOTO libraries every time they get to about 12000 images. Very disappointed in the cost of IPHOTO and won't ever use it again. It takes up way to much space and is always lost ( not always by me ....twice by apple store geniuses.

Answer 1

After posting I decided since I rant too much for your taste I would try another time. I ejected the smaller external hard drive and plugged the usb into the same place on my G5 as the one which was mounting and working before ejecting. It showed up.
The only question remaining is : Now I have no place but USB hubs to connect my other two external hard drives. I read in my NAPP web site of lots of folks with their 500GB firewire externals stacked up and in use with their computers.
Is there an order in plugging in and powering up an external after all is disconnected. I don't think I did anything different. The Current WD MyBook 360 is back alive. But I still need to get my LaCie firewire Porsche working. I only have two usb ports on the back of my G5 so I must have used my Belkin power enabled hubs before when I had them all working. I only disconnected due to a remodel of this office and it had to be done. Any referals to Apple referance articles on using external hard drives would be welcome. I have been unable to find any. Please disregard prior message today. It was the usb plug into my computer that I hadn't changed in my attempts to trouble shoot. always power.
I would like a good solid article about dos and don'ts with desktops and laptops and using external hard drives. I have lots of books and have a membership to local MUGG with MacFixit. Thanks for answering.