The 'iMac G5 Sleep Light Updater' updates the firmware on your iMac G5 so that the sleep indicator light is not as bright during the evening. The daytime brightness remains the same.
When you install the iMac G5 Sleep Light Update, you will need to restart your iMac G5 for the software to take effect. You will not get a dialog that prompts you to restart your computer.
If you haven't installed the iMac G5 Sleep Light Update but wonder if you should, check Software Update (from the Apple menu, choose Software Update) to see if the update appears in the list. If it doesn't, you have either already installed it or the update doesn't apply to your computer.
Note: Once the update has started, do not cancel or interrupt it. The updater takes over one minute to complete. During the update, your computer fans will run at full speed, but will return to normal once the update completes.
This document will be updated as more information becomes available.