Disk Drives not showing in Sidebar or on Desktop.  Any ideas?

All,
I'm having a strange problem that I first noticed last night. It appears that the internal disk drive on my PowerBook G4 does not show up on the desktop or in the Finder's sidebar, despite selecting these options in the Finder's preferences.
I do know that it was there when I first installed Leopard, but I'm not entirely sure when the icons disappeared. Nothing I do brings it back. This includes trashing all Finder and Sidebar preferences, trashing all caches, repairing permissions, and zapping the PRAM (I didn't expect results, but it was worth a try, I figured).
When I click on the icon for my computer, all that shows up is "Network". It's almost like the disk drive is invisible to the Finder. All other icons show up in the sidebar as they're supposed to, including iDisk, CD-DVD images, and flash drives.
I have the option selected in the Finder to show the path to the current folder in any given Finder window. I can access the hard drive that way.
Here's something else that's weird - when I have a new Finder window open, I click the "Path" button (addition to the toolbar). My internal hard drive is NOT SELECTABLE when I do this. It appears, but it's grayed out for some reason.
Has anyone else seen this? I'm going to file a bug report with Apple. If I hear anything, I'll post back.
Thanks!

UPDATE:
I found this article on the web:
http://www.pinkmutant.com/articles/invisible.html
So, as suspected, my internal hard disk became "invisible" somehow. My best guess is something happened when I auto-updated iTunes and/or QuickTime. See the article for details on the "SetFile" command.
Anyway, here's the AppleScript code that I found, and this should take care of it:
tell application "System Events"
set visible of disk "NameofDisk" to true
end tell
You should be able to launch the Script Editor application, enter the code, and click the "Run" button. That should fix the issue, after you log off and back on again (or restart the Finder).
I'll try this tonight when I get home. Meanwhile, if anyone else has this problem and can try this solution now, please do so and post your experience(s).
Thanks!

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