Sounds like a film projector

We recently started hearing a sound like a film projector eminating from one of our dual G5s. I have removed or stopped every fan that I can see (6 total, I believe: 2 in front for the CPU, 1 above it attached to the speaker, 1 behind the DVD drive, and 2 in back). I even disconnected the hard drive and the sound persists. There is not a disc in the DVD drive and the sound continues whether the DVD drive is opened or closed. It sounds as if it's coming from low inside the case, but it's hard to pinpoint.
I have not yet checked to see if there is something loose somewhere simply vibrating, but it doesn't really sound like that. It sounds just like a film projector.
Any thoughts?
Dual G5 2 GHz Mac OS X (10.3.9)

Well - there are a total of nine fans in the DP2 - one more at 90deg. to the others behind the hard drives and two at the front of the power supply, low down behind the silver perforated grille, running at a constant speed. If you shine a torch in the front of the grille you can see them. If the sound is regular and unchanging it may be one of these.
A previous similar problem is here
http://discussions.apple.com/thread.jspa?threadID=441186

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SUVORKIN,
Verified is a good status
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Developer Connection Document on HFS+ Volume Format says,
"Most files on a disk are rarely, if ever, accessed. Most frequently accessed (hot) files are small. To improve performance of these small, frequently access files, they are moved near the volume's metadata, into the metadata zone. This reduces seek times for most accesses. As files are moved into the metadata zone, they are also defragmented (allocated in a single extent), which further improves performance. This process is known as adaptive hot file clustering.
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Sounds like a film projector

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