External Hard Drive No Longer able to Mount

When my dad's iMac G3's power died we turn his G3's internal hard drive into a external so he could mount it to his new user account on my iMac G5. It's been fine until I recently had to force power of my computer. Now his G3 HD won't mount. We have 2 other externals connected. A USB 2.0 Maxtor connected for my Time Machine and his Firewire OneTouch used for his iTunes. Both of these still mount and work fine.
The OneTouch is connected to the G3 through firewire then they are both connected to the computer through a single firewire. Since the OneTouch still mounts I know it's not the connection.
We've tried using Disk Utility to repair and that says it's fine. It does show up there and can be checked but is grayed out and will not mount.
He has a book file he's working on, that he hasn't backup elsewhere along with apps that were purchased and have no way to recover so we can't erase this volume. Is there anything we can do to get this to mount like it has been?

Okay, yeah I knew that was a "duh"
That light isn't flickering, it's on steady. It's the drive indicator light that is doing nothing.
Turns out he had been saving the book to my hard drive and not his external like he thought so everything is there and backed up to Time Machine. Now we just need to purchase iWork to replace his Microsoft Office which was on the old drive and the reason he thought he was backing up to and working on his old drive.
He would still like to get the G3 drive mounted again but turns out he lost nothing.

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