This update is only for the 1.8 GHz, single-processor Power Mac G5 (Late 2004) computer and supports installation on Mac OS X 10.4.3 or later. Also improves the reliability of your Power Mac G5, especially after it has been inactive for two hours.
Use Software Update to make sure you have Mac OS X v10.4.3 or later installed on your Mac. To use Software Update, choose Apple/ Software Update. The Software Update window opens and a list of available updates appears. Select the items you want to install, and then click Install.
Note: Your Power Mac G5 must be connected to the Internet to use Software Update.
To update the firmware on your Power Mac G5, follow the instructions below. You can print these instructions so they are available while you upgrade your firmware.
Note: Once the update begins, do not cancel or interrupt it. The update takes over one minute to complete. During the update, the Power Mac fans run at full speed. They return to normal once the update is complete.
For detailed information on this Update, please visit this website: Power Mac G5 (Late 2004) 1.8GHz models stop responding randomly
To download the Power Mac G5 (Late 2004) System Firmware Update for Mac OS X 10.3.9 please visit this website: Power Mac G5 System Firmware Update for Mac OS X 10.3.9
After Installation Note: After installing the firmware update, there will be a residual folder installed on your hard drive called "AppleInternal". Inside that folder is another folder called "PackageDataTools". Inside that folder is an application called "Lurk-n-Launch". You can safely delete the folder and its contents.