Jun 28, 2008
I have a G5 iMac, 1G ram, with three external HD, a MIDI keyboard, and an all-in-one Canon print/copy/scan, running Leopard. Lately, my iMac has been turning off seemingly at random, like someone has hit the power strip (although other things plugged into the strip stay on). Sometimes it will reboot when I turn it back on, sometimes not. When it doesn't, it will get partway through startup, then turn off again. There is no apparent pattern to the point during startup where this happens, it's different every time. Sometimes, it barely spins the HD before going dark again.
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I took off the back and checked the power supply LED. It says the power supply is OK. I rebooted via the internal power button, and everything was fine for a couple of days. I set the preferences to "reboot after power failure" so it will reboot when I'm at work. I can go through the Time Machine backup list and see how many times it shut down and rebooted during the day (TM backs up once per hour, so when there is a significant length of time between backups, I know it shut down for awhile). The only recent addition is the installation of MoneyWell software, but this app isn't always running when the comp goes black.