I wonder why
you did not develop the laptop idea further. They usually start
out much quieter than usual desktops.
Well, apart from the fact that laptops have relatively poor ergonomics
and are difficult to repair and upgrade, they are an expensive
solution if you don't need portability. Also, most of my audio
hardware requires a PCI slot.
But the main reason was that I set out to build a completely silent
machine, and because of the tightly packed electronics in a laptop a
fan is typically required. These are usually very small fans
producing a high pitched whine when the CPU is under load, which is
exactly the kind of noise I was trying to avoid.
Cheers
Daniel