Compaq Presario SR5010NX Desktop
Celeron D processor 360
Windows 7 Home Premium
1 GB RAM
120 GB HDD
Intel graphics media accelerator
DVD/CD w/Lightscribe

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I have lots of noise coming from the tower 95% of the time...as soon as I access any feature of the computer, even moving the mouse just a little, it kicks in and sounds like a vacuum cleaner. There's lots of dust inside the box which I'll blow out with compressed air, and I think the two fans that I can see aren't the cause based on getting as close as possible to listen, but can't be 100% sure. Could it be the hard drive, heat sink, processor? Any help so I can find the culprit is appreciated.

sbuxman