Hi guys, I owns several Powermac G5. There's one particular Powermac G5 2.0 DP 2003 model that has been working fine for a few months. It was running really well until one day when I thought everything was fine, one of a new intern that has assigned to this system reported to me that the Mac keeps falling asleep within a few seconds it booted up in to OSX Leopard. I can be able to bring the system wake from sleep but it only last a few seconds until it sleeps again. I have tried a few methods like reset PRAM and SMC but nothing seems to be able to fix the problem. Tried plugging in a fresh installed SSD with Leopard but still the issue still occurs. I can be able to enter open firmware and it seems to be not sleeping in this mode. Anyone has has any clue of what wrong could this be?