Is my Hard Disk gone?

Hi~
I posted a topic on unrecognizable Hard Drive about a week ago. And people recommended me to replace new Hard Drive. But before I go to buy new HD, I want to know why'hardware Test'program passes 'Mass Storage'test.
When I did hardware test, everything was passed with no errors. But installation program still doesn't recognize HD at all.
If anyone knows why it is, please let me know.
Thank You.

Thank You, Jim for responding my post.
I tried all troubleshooting solutions from apple support center including your suggestion.
At disk utility option, Hard Drive wasn't recognized.
I only see CD drive.
Except 'Hardware Test', not any program or utility recognize my Hard Drive. What my question is why apple hardware test program passes 'Massive Storage' check O.K., when other utility programs don't recognize it.
I want to know what is the functions of 'apple hardware test. If my Hard Drive is gone, shouldn't this test respond to HD test with error code?
I can't give up my HD until I know why... (^_^)
If you know about it, please let me know.
I want to be free from this questioning....(^_^)
Thank YOU~~~

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This question was solved.
View Solution.

You do not need the license key when using HP Recovery Discs.If you didn't create a Recovery Disk set using the software installed on the laptop refer to the article here>> Looking for Recovery Discs?
If you have difficulty, contact HP in your country / region through the HP Worldwide Support Portal to check on the availability of Recovery Discs for your computer.> Worldwide Support Portal
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Hi,
I have a late 2007 macbook (white). I was using it when it froze while listening to itunes. I've pressed the power button to turn it off and turn it back on.
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