[soah]

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it must be from a moving part, and there arent many of them in there, there is likely a 2nd fan (on your video card)

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I don't know a whole lot about the inside of computers, and I didn't know that video cards had fans... I think the thing making noise is the hard drive, but I don't really know what the various things look like so I hope I'm wrong?

Also, I have left the computer on nonstop for several days in a row... I'm wondering if this has caused some problems. I'll try leaving it turned off more over the next several days and see if the noise goes away...?

Worst case scenario is that my hard drive is dying I guess... what sort of a time frame am I looking at before it shuts down completely? I've had this computer for a bit less than four years... it seems like it's too young to be having these types of problems? But as I said, I don't know much at all about computer hardware...