The fan noise is clearly ruling out any other noises(if any).
"insulated noise cabinet computer case" ? I have searched the web a bit...
I've come to find out about server cabinets.I just have one server.
And those server cabinets I found are really large.
The location of my server at the moment is in my closet.
People
here told me that I should suspend my disks with elastics in the air.
Also I have had
some other problems regarding the HP tools that should come with the machine(and didn't)
and that are supposed to regulate the frequency at which the speedfans turn based on sensors