External HD Won't Mount - Force Ejected it and now won't mount

Hi All,
I seem to remember this happening to me before. Isn't there somewhere in the filesystem that OSX writes a file if a drive was mounted? And if you ejected a USB disk incorrectly, it cannot ever mount again?
I can't seem to find that fix anywhere.
ANYWAY, my problem is this. My TimeMachine backup disk (Western Digital (WD) 500 GB MyBook) won't mount (attached via USB). It doesn't show up in the Finder. It DOES show up in Disk Utility but when I click Repair Disk it promptly says:
"Error: Disk Utility can’t repair this disk. Back up as many of your files as possible, reformat the disk, and restore your backed-up files."
I really don't think the disk is fried. I think there is just something keeping it from being mounted. I could be wrong.
Any ideas? Thanks in advance. Struggling with this waaay too late on a Sunday night.
I'm running Snow Leopard 10.6 (10A421a)

Hi whatstin
See the lower part of > http://support.apple.com/kb/HT1317
+1. Shut down the computer.+
+2. Disconnect all devices and all other cables, except the keyboard and mouse cable(s).+
+3. Disconnect the computer from the power outlet and wait for 3 to 5 minutes.+
+4. Plug the computer back in and turn it on.+
+5. Reconnect the device(s) (one at a time if there is more than one) and test. Test with each port if you have more than one.+
If nothing then try a different USB cable.
If still nothing contact WD support @ http://support.wdc.com/?wdc_lang=en
Dennis

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