External HD won't mount -Mercury Elite

Hi - I have a unibody 15" MBPro. It has only one Firewire800 port on it and I'm inquiring at this forum to hear about anyone else having problems with that port not working with a particular device.
Over the years I have collected 7 external drives - various makes and sizes. I never have more than 2 connected at a time. Mostly connected with FW400 to 800 hybrid cables and many without power supplies, relying upon the power from the computer's port. Every one of these works without a hitch every time.
The device in question is a "Mercury Elite-AL Pro mini" portable drive. I've seen this name touted often on this forum. This is the first of this particular brand/style/name I've purchased. The problem I'm having is that it doesn't mount or stay mounted in any reliable way. Often it doesn't mount at all, no matter what type of rebooting, power recycling, chaining, or power sources I use.
I bought one new from a favorite retailer who has been extremely accommodating. I returned it 2 times for "repair" and eventually received a replacement- which has the exact same issue. The drive will light up but not show up anywhere on the computer. I don't even know IF or HOW this new drive is formatted.
So - I've been "around the block" with the retailer about the product and I thought, in fairness, I should check on the MBPro. Is it possible that the port or OS is lacking in support of this particular model drive??
Has anyone had a similar experience. Can anyone offer a solution?
TIA your input.
JL

In reply to arnie: Good tips!
I'll just add - booting holding "AppleOption+OF" boots into open firmware. I've never booted into this mode (on purpose...) but it seems to be (correct me if I'm wrong) a unix interface to OS X. Just make sure to type the commands EXACTLY. Unix is much pickier than OS X.
I've heard problems like this before - usually with those little bus-powered HDDs and Powerbooks. It's something to do with the amount of power the Powerbook puts out, although it should be the standard 500 mA that the USB 2 specs require. This can happen with firewire, however. If there's a power cord, use it.
You might try plugging the drive into a self-powered USB 2 Hub - one with a cord that plugs into an AC wall socket, then connect it to the Powerbook. If the Powerbook recognizes the drive, then it probably needs extra power.
Good luck
-Dan
15" 1.67 Powerbook G4 (Jan 2005), 400 mhz AGP Sawtooth G4   Mac OS X (10.4.8)   4G Clickwheel and 5G Vid iPods
Message was edited by: Daniel W, stupid grammer!

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       8:              Apple_Patches                         256.0 Ki   disk3s8
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       1:        Apple_partition_map                         31.5 Ki    disk4s1
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    Connection Bus :
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    Universal Unique Identifier :
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    Can Be Formatted :
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    Bootable :
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    Supports Journaling :
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    Journaled :
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    Partition Number :
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