External Harddrive doesn't show in Finder

Finder won't show my hard drive. It's never been a problem before, but now it won't show at all. Disk utility shows it is connected. What has happenned, and how do i fix it?
Thanks,
Vincenso

Is it connected via USB or Firewire?
USB and FireWire Quick Assist
http://support.apple.com/kb/HT1151?viewlocale=en_US
What to do if your computer won't recognize a FireWire device
http://docs.info.apple.com/article.html?artnum=88338
Dealing with FireWire problems (drives not mounting, devices unrecognized, etc.)
http://www.macfixit.com/article.php?story=20041221081432908
Common fixes for USB device issues (unrecognized, etc.)
http://www.macfixit.com/article.php?story=20070824012114701
 Cheers, Tom

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External HDD doesn't show on finder.

Hello community!
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If the drive has more than one interface (USB, FireWire, Thunderbolt, eSATA), try one of the other interfaces.
Check that the data cable is securely inserted at both ends.
Try a different cable.
If you're connecting the drive through a hub, connect it directly to a built-in port on the Mac.
If you're connecting it directly, try a different port.
Disconnect all other devices on the bus, or as many as possible.
Test the drive with another Mac. Test another drive with this Mac.
If the drive is bus-powered, but has an AC adapter, connect the adapter.
Boot into Recovery and launch Disk Utility. Is the drive recognized?
Start up in Safe Mode and test.
Reset the System Management Controller
If the drive doesn't work under any of the above conditions, and if another drive does work with the same Mac, then the drive has failed. You may be able to salvage the mechanism by removing it from the enclosure and installing it in another one, or in a drive dock.

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I have done an unsafe eject two weeks ago of my external hd. When I try to connect the hd again it doesn't show in finder. I've tried the disk utility but that doesn't work. Are there any other ways to get the hd working again?

I had this problem a few days ago…
I solved using the following steps:
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4) Run Disc Utility, first "Repair Disc" then "Repair Permissions" on the internal HD (which actually threw up a total of 4 errors).
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External Harddrive doesn't show in Finder

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