External Hard Drive worked and now doesn't work

I've got a Macbook Pro and a Seagate external USB hard drive. I had the hard drive attached and everything was going good until it became disconnected from the computer without being ejected. Now whenever I try to plug it in i get a message saying that the disk is unreadable to this computer, or something to that effect.
After searching around, some people have suggested to others in similar situations to use Disk Utilities to repair it. When I open Disk Utilities, the HD is listed in the sidebar, but it won't let me repair it, or mount it.
Any suggestions for getting the hard drive to work again? Thanks in advance!
Kyle

This may be of some help.
For Seagate drives, you can download the free SeaTools utilities from Seagate's website. Unfortunately I think they only run on a PC. However, you should be able to look at and test the drive with these utilities. I had a Seagate drive that somehow had it's partition info altered when I plugged it into an old laptop. I put the drive physically into a PC laptop and then used SeaTools on a boot CD to reset the drive back to its Native Drive capacity. Took it out and back to the Mac and then everything was visible again.

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Morning fin26may,
Thanks for using Apple Support Communities.
Use these suggestions if you encounter issues with the device.
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151?viewlocale=en_US
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External Hard Drive worked and now doesn't work

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