Old Quiet Setup:
- Antec SLK3700AMB
- Power Supply- Antec 350W(SL350)Smart Power
- AMD A64 3000+ Newcastle @2.39ghz 9x266
- Zalman 7700Alcu Ducted
- Case fans- two Globe 120x25mm fans
- Seagate 160gb 7200.7 Sata w/ncq
The setup above was pretty quiet around 20dba, all my fans were spinning below 1000rpm and the hard drive suspended. Loudest thing was the power supply. I was thinking about upgrading to a seasonic or a fortron power supply and getting a passive water cooling system. But even after all that, at best the system would be real quiet but still not silent.
New Silent Setup:

There is a tool room next to my bedroom. I moved a cable wall outlet and drilled two 1/4" holes. Then I ran through the wall one 10' usb extension cable for usb hub, one 10' ps/2 extension cable for keyboard , one 15' firewire cable for external drive and one 10' extension monitor cable. I even swapped my case fans to two 120x38 sanyo denki 105cfm 38dba fans and still silent, no noise in my room.
Yes, silent. no fan noise, whining seeking or anything.
I power up the system with a keyboard like ive done for years.
I'm at work right now, ill try to take some pictures when I have time.