Hello. Recently i bought PowerMac G5 (Dual 1.8GHz, June 2004) and it's really loud. As i read on forums, it's good to do "Thermal Calibration" from ASD discs, so i found v2.5.8 and v2.5.7 and burned them on CD-RW. Both versions just haven't "Thermal Calibration" option, even after Standalone...