Volumes Greyed out in disk utility

tried to do averify and repair disk when it finished the volumes/partitions are greyed out

Where are you running Disk Utility from - the boot
system, or an installation disk?
from the actual system yea, I understand about thenot being able to unmount a volume you are on but the disks that were doing it were not the system disk so I was able to do repair and verify disk to mount/unmount, they would go through fine but the volume would stay greyed out not the actual disk itself. One is a int HD the other was a ext FW 400 drive. I have haad a lot fo problems laltely so if you want to read all the thiings that have happened here they are. OH thanks so much for your help
OK before I forget the way all this happened I will write it all down so here it is.
I was trying to hook up a ethernet conn to a muse receptor (music gear)I realized after I wasnt successful setting it up that my main Macintosh HD was missing from the desktop , When I would do a search I would see it and could acess it but it was greyed out. I did repair perm it was ok. I tried moving it to the sidebar ,no luck. I then installed a OS x on an ext HD and repaired and verified the disc that way to unount and remount all was good. WEnt back to real Os ,still not there. Then SOmeone in an email said to run a apple script
"System Events"
set visible of (choose folder with invisibles) to false
end tell when I did I then realized that now my other HD is missing from my desktop and I also accidentally made it go poof from the side bar too. now if I go to finder and try to hit show HD nothing happened.
SOMEONE PLEASE HELP!
More info if I do command shift G for , /Volumes/Macintosh HD/ it goes to a shortcut for it and if I do it for the Audi HD I get a short cut to it but this time it is a network shortcut icon
Also My iDisk which I never use is stuck on my desktop and cant get rid of it
I think what happened is maybe I got my user and my main hard drive volume switched up cause if I look into that Macintosh HD and go to users/myname/desktop it looks the same as my current desktop
OBviously these are all guesses
Update
Now when I hit the audio shortcut Icon it says it cant be found and to insert the disk or connect to the sever volume and wait for it to appear on the desktop
Matt

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