On 6 Jul 2006, at 23:22, Neil wrote: > I have a Belkin 720VA UPS. My dual G5 is connected to it. The UPS > should > be able to power my Mac for at least a few minutes, but it > doesn't. Even > when the power only goes out for a second, my Mac turns off. There > must be > a way to run the Mac off of the battery for at least a little while. What happens if you plug only a desk lamp into the UPS and disconnect the power? Is your Mac connected to the UPS via a serial or USB cable? These allow the UPS to tell the Mac its current battery status. When this is configured correctly there should be a setting in System Preferences (under "energy saver"?) which tells the Mac how long to stay on before powering down. You say "even when the power only goes out for a second, my Mac turns off" - it -should- at the least undergo a safe shutdown procedure. If it powers down suddenly then something is definitely wrong. Stroller.