As far as I can determine, this is what you're asking for. Am I correct? (I happened to have an old copy of DxDiag on my backup hard drive)
System Manufacturer: ECS
System Model: 945P-A
Drive Model: WDC WD1600JS-60MHB1
I did a little research and found this bit of information: link
The sound my computer is making is identical to the second sound bite under the "clicking/knocking/clunking/sweeping noise" section of the article.
...which I suppose gives me my answer.
I don't suppose you know if the data is recoverable in this situation (and how much such a thing would cost me)? My last backup is a couple of months old, and there's a few songs I bought off of Amazon that never got backed up.