How "Get Back" Lost Internal ("Macintosh HD") Drive?

I already have a thread on the forum, but I thought I'd start a separate thread to address a very limited, but perplexing, question:
After unsuccessfully running Disk Repair from the Installation disc, I "lost" my internal drive (called "Macintosh HD", I believe). That is, it doesn't appear in my list of devices in Finder, doesn't appear in the list of devices in Disk Utility and doesn't appear on my desktop.
The disk probably needs to be repaired, but I can't do anything until I get the drive back. It's as if it was ejected (which it wasn't).
Can anyone tell me how to get it back?
Thanks for your help.

Worth checking Finder preferences. Click on the desktop Finder>Preferences>General and make sure there is a tick against 'Hard Disks', then click on the Sidebar tab and make sure Hard Disks is ticked. Not sure this will solve your problem but it's a good starting point.
To repair the disk you will need to startup from your OSX install disk - disk in drive and startup holding down the 'C' key. After the 'choose your language' screen from the Menu Bar select Utilities>Disk Utility then select your Macintosh HD (hoping it's listed) and 'repair disk'

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