TS1440 My hard drive is not showing up in the disc utility folder

My computer froze and I had to turn it off via the power button.  Upon restarting, I encountered the screen with the flashing folder with a question mark. I followed the first couple steps, as well as some steps for the gray screen to no avail.  I got to the step where you inset the OS disc and start from that, but when I opened the disc utility folder, my hard drive was invisible, as if it didn't even exist. The only thing that appears is the DVD. What does this mean, and how can I make it appear?

It means the hard drive has failed and needs to be replaced.

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