Trying to determine what's wrong with a Power Mac G5 (June 2004). The user went to reboot it the other day after installing some drivers for his GPS. It shut down normally, but wouldn't chime and start up again. I've tried: - unplugging everything and letting it sit for a minute or so (to reset the PMU?) - remove the battery from the motherboard, hold down the power button for 15-20 seconds. Then try to turn back on. - measured voltage on the battery is 3.60. Markings on battery indicate 3.6V - removed and reseated 3 of the 6 memory DIMMs. Was going to try to remove the power connector to the motherboard, but decided to try that later Observations: - user said that after a power failure in the home he'd have to reset the date and time - machine will power on, no chime, sit for a while, after several minutes the fans will slowly ramp up to full speed If the battery is bad then the machine should still boot, right? Only problem would be that you'd have to reset date and time and other settings after a power down / unplug. And I suspect given the age of the machine and the measured voltage that the battery is in fact bad. But probably not the reason the machine won't chime and boot. I suspect that it's likely the logic board has failed. Guess it could be bad RAM as a second. Third would be power supply. I can remove and reseat the RAM. Don't have a Mac G5 power supply (don't think any standard PC ATX style power supply will swap in, will it?) Just want to be sure there's not some simple fix before I price out a logic board, which will probably result in it's owner just buying a new machine. Which is fine, as long as this machine is truly dead.