External Lacie Drive Won't Mount After Improper Disconnection

My internal extra (not the system) drive disappeared. In my panic, I did a lot of things that I don't recall in detail, like restart. That didn't work. I then shut down the Mac Pro w/Snow Leopard  totally, and upon reboot, that worked. The internal drive mounted. But somewhere in the midst of it all, I disconnected my Lacie external HD without ejecting it.
I thought nothing of it until I attempted to remount it and it failed to mount. I then tried on my new MBP (also SL). It wouldn't mount. So I tried the whole shut down/reboot regimen that made my internal drive re-mount. No luck. I even tried using a power plug and USB connection instead of a firewire 800 cable. Oh, and I swapped FW 800 cables too -- nothing.
Next, I tried a 4 disk utility apps including Apple's, but if the thing doesn't MOUNT, none of those apps can 'see' it.
And yes, I did an extensive 2-hour web search to no avail because many people have similar but not the same issues, no one offered a solution that worked for me or the answers are dated.
When connected, it lights up rapidly like it's being read, then remains steady, but nothing happens. Maybe there's just a delay reading it?
The next step will be taking it to Tek Serve unfortunately. I don't understand how one drive re-mounted, but this one, even on a different computer, is just ghost.
Computer: Mac OS x Snow Leopard
Drive: External LaCie

Hi Kool G4. I think that I'll take a trip to Tek Serve tomorrow and see what they can do. I was hoping for the same luck I had with the internal one re-appearing, but so far nothing.
I guess that every once in a while when something is improperly ejected, the warning is valid. There have been so many improper ejections (not on this drive) that have not resulted in a failed drive. My luck, and on my very important drive. Bummer.
But thanks to all of you for offering your wisdom.
I'm going to leave it overnight plugged in just in case it's just a slow startup issue. *crossing fingers*
Otherwise, I do hope that a specialist can recover the data.

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