Mac Mini emitting a constant clicking soud,

I have a Mac Mini that started exhibiting the following problem. From the moment I turn it on I hear a clicking sound coming from the machine. It is rapid and constant.
I did all of the tests, hardware test, boot into single user mode and did a fsck on the file system. It came back clean.
The machine boots, but the video is screwed up. The Apple bar at the top of the screen is not visible.
The only thing unusual is that several days before, the software update manager updated some firmware. No idea what kind.
Any ideas on the cause and/or remedy?
Wayne

Thanks for the advice. I figured it's the hard disk. It's still under warrenty. But unless I cough up $100 (ProCare) for something still under warrently, I have to make an appointment at the "Genius" bar the day I want to go in. I don't need a "Genius" to know the hard disk needs repair. I'm not liking this support by endless fees at all.

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