External hard drive isn't visible, won't mount

Hi,
I have a WD MyBook external hard drive that is not working correctly with any mac. It randomly stopped showing up on the desktop or in the finder. I don't move it around at all, so I have no idea what the origin of the problem is. I have tried plugging it into a black Macbook, white Macbook and Macbook Pro with the same results. It shows up in both the System Profiler and Disk Utilities. In the System Profiler, I can get information on the drive. The only thing I see of note is that there isn't a mount point. In disk utilities the hard drive is gray. When I click on it to repair it, I can only repair or verify the disk. When I do that, it tells me that the drive "appears to be okay". I try to mount it and it tells me it cannot be mounted and to try running first aid. I also can't eject it.
I'm at a loss at this point. Is there something else I can try?
Thanks in advance for any suggestions and sorry for the long post!

Had the exact same problem yesterday and wanted to share how I solved it. It first happened a couple months ago. Would not mount on my Mac Pro, but it did show up when I connected it to my laptop. I solved it by just shutting off the Mac Pro, unplugging it even, and unplugging everything from the My Book drive. I let it sit for 3 hours. Started the Mac Pro up, then put FW cord into My Book, then into Mac Pro, then connected the power cord for the My Book. That worked. For some reason.
But I tried that again when My Book Pro Edition disappeared yesterday (could see it grayed out in Disk Utility, but it would not mount) and nothing would bring it back. After looking through the Western Digital site, I figured it had something to do with the partition being bad. I thought I'd have to buy Stellar Phoenix data recovery software, which might have recovered my data. But first I went out and bought Disk Warrior. Disk Warrior fixed it! I'm back up and running.
My theory on why My Book Pro Edition had problems this second time. To save my on my electric bill I write this during the recession), every night after I shut down the Mac Pro, I also turn off the power strip. Cutting the cost of "vampire" electricity, as they say. Now I see I wasn't shutting down the My Book properly... you need to follow the Safe Shutdown instructions -- pressing Power Button once. Although I also have the My Book Studio connected which hasn't been affected by my turning off the power strip as it seem to shut off by itself when the Mac Pro is shut down. I think improperly shutting down the My Book Pro every night is likely the reason Disk Warrior diagnosed the problem as a "severely damaged directory."

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External hard drive isn't visible, won't mount

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