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I could have fixed it. It's funny how most techs don't understand how to repair PS units. It's like a lost art of some kind. It was the supply. The water cooling leaked where I could not see it and shorted a Zener diode on the power supply board. Damn water cooling units.

Power MAC G5. Press power, lights up, fans BEGIN to spin then shuts down. Within 1 second. Tried: New RAM, new set of Processors, Video, Hard Drive. Motherboard or Power Supply?? Anyone see this? Thanks much!!

Ok I am wrong. "IBM" will not release the rights to produce the processors and parts. I am speaking from a business standpoint not a Tech standpoint. This would be a condition of IBM and in short, APPLE. Reading over the deal IBM and Apple made and the investment in a new facility in New...

Thanks, I ask because I see a lot of second hand retailers selling used processors and/or logic boards and they ask you to check your serials to try and find a 3 digit EEE code or something. They never really explain WHY that is. Is it just the calibration or is it more then that. I have 2...

I appreciate the response but If I had a second 1.8 system, I would not ask this question. Can a matched pair of 1.8 dual CPUs be added to another 1.8 dual MoBo with different serial numbers?

I did a search and did not find the answer. I was wondering if I can replace my Dual 1.8 G5 Powermac CPUs with another set of 1.8's that have different serials? I have a Mac tech friend that can thermal throttle the CPU's for me once their in. Will this work? Thanks

I examined the CPU board of both the dual 2.7 and the one dead 1.8 cpu. On all three some of the SMD components where missing or have partially detached from the board. I replaced them but the CPU still does not power up. It seems once these CPU's go, they overheat and "pop" some smd components...

The dual 1.8 system boots with the 450 watt but it seems one of the CPU's died. That's unbelievable. It boots with one cpu in the top slot. It was working a week ago. ????

Yup. It's suppose to be a 600watt: http://support.apple.com/kb/SP46

Ok.. I just stripped the dual 2.7 system. It looks like there was a small water leak at some point. Nothing major but the power supply is a 450watter unit with 2 12v rails. How cn this be when a dual 1.8 system with no water pump is a 600w with 3 12v rails? Am I right in assuming this is not...

Heres a good one. On the other working power supply, when you first plug it in you hear a click. Like a switch goes on in the supply. Relay I believe. On the dual 2.7 supply I do not hear that switch go off or on. Does the 2.7 have a differant supply, or are they all mostly 600watt systems in...

I have 2 system displaying the same symptoms. One is a dual 1.8 One is a dual 2.7 water cooled. The dual 2.7 does not show any LEDS. I thought the same at first but nothing is lit up. This is so odd. The strange thing is the dual 1.8 was working a week ago now nothing. I put the working power...

No leads are on next to the ram slots. I put in a working Power supply in the dual 1.8 with the same issue and it remains the same. I will check the serial number.

I have another with the exact same issue now. Great. Dual 2.7 water cooled: 1) When I press the button, the front LED lights up but goes off after release. 2) Fans start up, water pump goes, hard drive spins, dvd drive spins (if there's a disk). NO chime no beeps. 3) There is a red LED light...

I have a mac pro plasitic clear keyboard. I have tried everything and still nothing. Seems the G5 iss not accepting any key strokes on mine. It's almost like the open firmware is corrupt. Anyone have any suggestions?

I seated the processors and still no luck. I think my version will not boot like that. When removing either processor the system will not start. How did you boot to DVD? I have a MAC compatible keyboard not an OEM. Is that a problem? It's not on the other system.

I have the exact same issue with a dual 1.8 and checked everything. I replaced the ram with working ram, replaced the video card with a working one and checked everything. I tested the battery and it is fully working and has a full charge. I have no idea where to go from here. This system was...