2TB Western Digital Drive won't mount in my Mac Pro. Please Help

Hello, everyone. I have a Mac Pro (MacPro1,1) with an internal drive that won't mount. I bought it used last year with 12GB RAM and 1TB hard drive and SuperDrive. I have since upgraded storage with an internal 2TB drive from Seagate (no problem), and a 500GB drive (no problem) from Western Digital, and installed a second optical drive from an old Power Mac G5. I had an additional newer 2TB drive from WD that I bought as an external. I took it out of its case and put it in a carrier and then in Bay 4 of my Mac Pro. It's the only drive I've had problems with, and I don't know why. The drive is immediately rejected by OS X upon startup. The options include "Eject" and "Initialize..." but I've clicked initialize every time. Disk Utility opens and I can see the drive but for whatever reason, it will not mount. There is one partition on it, and I think when I bought it, I formatted it with GUID and Mac OS Extended (Journaled). I haven't used it as a Time Machine drive, but I've backed up some files on it. I've restarted several times, and I'm not sure if I can hear it spinning inside my computer.
Should I pull it out and see if the partition is still on the disk? Wha

When DU launches or launch it yourself, that is the most useless "eject, ignore" and there is no real initialize command anyway anymore.... Click on raw drive WDxxxx and goto Partition tab, change the number of partitions to anything (another silly item) so you can go to the Advanced Options finally
WD MyBook drives are often not standard SATA drives with power and data connectors.
Does it look like one?
It should be GUID but make sure, you can also tell from the status below.
Might even change it to something else, erase, then set it back to GUID.
Apply. And only then does it matter what user partitions you create.
Jump through hoops for no reason.
If you have Windows or a PC, use WD Lifebuard. Great at testing any SATA drive.
Quick format with zeroes. Then Extended Test. Maybe even Full Format with zeroes to insure no bad sectors.
When and where, at what point in time, did you use it and write files to it?
By "carrier" I assume you mean the drive sled to go inside the Mac Pro.
Did you ever use it in an SATA external other than WD? some of their MyBooks are moled into and drive and case cannot be used separated.

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I fixed it. I found another post that seemed similar and this worked:
Yang
Posts: 862
From: London, UK
Registered: Feb 28, 2003
Re: warning message-DISK IMAGES FAILED TO MOUNT
Posted: May 15, 2006 1:12 AM in response to: perrppc
It might have something to do with your kextcache. Try moving the following three items to your desktop and perform a shutdown (not a restart)..
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