G5 Powermac Dual Core Power Supply Issue

My G5 Dual Core 2.3 GHz was working fine till this morning when at about 6:00 AM the power supply started making a bunch of noise. Luckily I was at home not at work so I pulled the plug...waited a while, powered on again, saw the apple logo and decided to turn it off till I get it fixed.
This is the third G5 I have with power supply issues. The first one was a dual processor that hums when doing a lot of networking or when attaching USB flash drives...so apparently there was a extension program on that one. I sold that and switched to the dual core machine, then both of the dual cores had power supply issues. One got replaced under Apple Care. The 3rd one just had the issue happen.
Anybody having bad luck with these? My old G4 DP 1.42 has been running almost flawlessly since it came out (only replaced the main fan for a more powerful and quieter unit).
Have the power supplies for the Dual Core G5 machines been redesigned or should I expect my new one to fail again?

Hi Jack,
I'm sorry. You did note that with your first G5 you knew of the extension program. Too early in the day for me I guess. Personally I haven't sensed from the G5 discussions that Power Supplies have been a major continuing issue, but there certainly have been a lot reported. Usually it's Logic Boards that keep getting fried for one reason or another. Fortunately it doesn't seem to be the most expensive thing to replace, especially if you buy a used one. Maybe someone will chime in who is more observant then I am this morning.
For what it's worth I still have the first Mac I ever bought which is a PM8500. It still runs fine whenever I pull it out from it's dusty storage. By contrast this is my third G5.
Edit: Up early and fasting for a test... I just caught your reference to 3 years. That time frame I have seen a lot here, usually 3 years plus a few months, just out of Applecare. Apparently for G5s thats like 90 in Mac years.
Message was edited by: Samsara

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