External hard drive will no longer will mount.....

I have a mac-mini OS 10.5.4 and a Hitachi-SimpleTec 500GB HD. Has been working beautifully and now, the icon for this volume is just (poof)...gone from the desktop and will no longer mount.
Here's the kicker. Went to Disk Utility>First Aid and the HITACHI HD shows up in the list to the left. Y'know, there's that first tier that says "465.8 GB HITACHI HD..." And then, just underneath (of course) there's an indention and the personal name of what I call my drive...(AND THAT IS ACTUALLY GRAYED-OUT)
But anyway, I still proceed to go through the "First Aid" process.....
"Verify Disk" which it says, "The volume (blah, blah)...appears to be OK.
(NEXT).....
"Repair Disk" (same thing) The volume (blah, blah)...appears to be OK.
But, it absolutely will not mount!
Now, what I have also tried is to "right-click" on my hard drive icon (still right there in the left column of "Disk Utilities"). And it gives me the option to, both..."Mount" or "Eject" the drive. Well, I've tried both! (lol) And I get the following error messages (each time)
Mount = "The Disk (my name, blah, blah)..could not be mounted. Try running First Aid on the disk and then retry mounting" (Of course, I've done the First Aid and it all said "OK"
(SO THEN I TRIED)....
"Eject" which said, "The Disk (my name, blah, blah)..could not be UN-mounted.
Make sure all applications and files are closed on this disk" (what could be "open" on this disk that won't mount in the first place?)
Okay, guys! VERY, OVERLY DESCRIPTIVE I KNOW....BUT, I'm desperate! I WANT to finish my mix I was working on and need my music. My system has been shut-down/restarted...(all that stuff). I hope I haven't left anything out! (lol) I HOPE, EVEN MORE SO that it's something relatively simple as well.
Many...many THANKS!
peace.

Yes. Thanks for the response. I followed all the steps you gave a little bit ago. And still, the Drive comes on, the led light flashes once. I can here it kick on. But, the usual icon for it is still not in finder, not on the desktop. But, of course it shows up in disk utility. Again, the first line that says, "465.8 Hitachi HD...." And that second line which says, "deejayWESTBROOK LIBRARY 1" is grayed-out (but I can still click on it....still won't mount...(or eject). But, it still gives info about the drive:
Name : deejayWESTBROOK LIBRARY 1
Type : Volume
Disk Identifier : disk1s1
Mount Point : Not mounted
File System : Mac OS Extended (Journaled)
Connection Bus: USB
Device Tree : /PCI0@0/USB7@1D,7/@5:1
Writable : Yes
Capacity : 465.8 GB (500,107,829,248 Bytes)
Owners Enabled : No
Can Turn Owners Off : Yes
Can Be Formatted : Yes
Bootable : Yes
Supports Journaling : Yes
Journaled : No
Disk Number : 1
Partition Number : 1
And lastly, both "repair" and "verifiy" say that the drive is "OK"
Thanks.

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