USB problems with new external HD

I recently bought a 160 GB external USB 2.0 drive to use with my iBook G3 (900 40 GB HD 14” screen) and it seems to have wacked out my USB ports. One simply isn’t working at all. Through the other, I use a USB hub to plug in my drive and other USB devices. I have the drive partitioned into a backup, a folder for my iTunes music, and one general purpose partition. The icons don’t always show up on my desktop without restarting and when they are there, sometimes they just blip out for no apparent reason. Plus, the other devices plugged into the USB hub (Griffin iMic, AirClick, RocketFM and iPod cradle) are erratic. Before the new HD, I had used all of these a long time with no problems. I have had to reset my iPod a couple of times because it loses functions.
Reading these forums, I am beginning to wish I had gone with Firewire instead for the external hard drive. I see inexpensive Firewire enclosures for sell on eBay. Could I take the hard drive out of the USB enclosure and move it to a Firewire enclosure? And is it really as easy to insert the drive as the enclosure vendors make it sound? Or does anyone have a simpler suggestion? I have tried zapping the PRAM but could not tell a difference. And I have thought about reinstalling the OS. I am running Panther. I have thought about going to Tiger. Could this be helpful? Is there a way to tell if my USB plug-in socket is physically damaged? I have also seen suggested here that faulty RAM can cause problems. I am maxed out at 640 and it all shows up in the system profile.
I know I am asking a lot of questions here. Any and all suggestions will be appreciated.
iBook G3 Mac OS X (10.3.9)

I recently bought a 160 GB external USB 2.0 drive to
use with my iBook G3 (900 40 GB HD 14” screen) and it
seems to have wacked out my USB ports. One simply
isn’t working at all. Through the other, I use a USB
hub to plug in my drive and other USB devices. I have
the drive partitioned into a backup, a folder for my
iTunes music, and one general purpose partition. The
icons don’t always show up on my desktop without
restarting and when they are there, sometimes they
just blip out for no apparent reason.
Is the drive a USB self-powered drive or does it have an external power supply?
If it is a USB self-powered drive then the iBook's USB port probably isn't powerful enough to run the drive and this is impacting on the other USB devices.
If you can get a power supply for the drive that is certainly one option.
Reading these forums, I am beginning to wish I had
gone with Firewire instead for the external hard
drive. I see inexpensive Firewire enclosures for sell
on eBay. Could I take the hard drive out of the USB
enclosure and move it to a Firewire enclosure?
Possibly, depends on the drive and how it has been configured.
And is
it really as easy to insert the drive as the
enclosure vendors make it sound?
Certainly the enclosures I have used have been easy to use.
Or does anyone have
a simpler suggestion?
Sell the USB drive and buy a Firewire drive, could be cheaper than buying an enclosure.
iFelix

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