lost volume not showing in disk utility

My Daughter turned on the computer to see a grey screen with a circle with a line in it. I reset the PRam and then I got a blue screen with a folder an a question mark. Reset the PRam again, inserted an original install disk, When prompted to choose where to install, there is NO volume. The Hard disk completely disappeared.

I see the Apple logo, the turning wheel like everything is OK but there is no volume.

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