hi, troubled G5 owners, i have a dual G5 2ghz and i had the noise problem (firewire,usb, pci and internal). i called the apple support, told them my problem, got a claim id, and they told me where i have to go to change the power supply. that cost me a phonecall and 2 hours waiting to get it fixed. simple.. :) oh btw, it`s really quiet now bye djraw