External HD with USB Connection no longer recognized

Hi,
I have read all the posts here and in most cases the problems are with an external HD that uses Firewire. Mine uses USB.
It has been working fine for a year and now it won't show up on the desktop. I went to Disk Utility and it was there. When I clicked verify, the external drive kicked into gear and the log said there was no problem. But I still can't see the drive or access any of the file I have on it. Any thoughts?
eMac (USB 2.0)   Mac OS X (10.4.10)  
eMac (USB 2.0)   Mac OS X (10.4.10)  

It has an external power source. Here is something really strange. When I open disk utility, it shows both the Hard Drive and the External Drive.
Now it has two entries for the main drive. On the first line it says 38.3 GB Maxtor, and underneath it says Macintosh HD, both lines have the same icon. For the external drive it says 111.8 GB external media on the first line, and on the second line is says simply external drive (which is what I named it). However the icons for the external drive are not same, the bottom entry looks like a little piece of paper with a fold in the upper right, while the top entry is a little orange box with a USB symbol.
This may not seem like a big deal, but to be its as if the computer knows its there but has no idea how to read it.
Also on disk utility it has 111.8 for the capacity but is blank where it should list available space and used space. It also says number of files is 0.

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