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The Mac Pro First Generation is an Intel Xeon-based workstation computer manufactured by Apple Inc. The first generation model includes the machines from 2006 through 2008.

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Mac Pro Power Supply dead?

Mac Pro 2.66 GHz Quad-Core Intel Xeon

For the past 4 months my Mac Pro 1,1 quad 2.66 has been crashing. I replaced the ram using the specific fully buffered ram, in a pair etc. Blew out all the dust from fans and power supply with a blower. running smoothly all day and left it running overnight. this morning found it to be dead.

when i press the power button not a single light on the logic board comes on, no fans starting up or electronic noise.

i tried to reset the SMC and the button above it on the logic board with no result. removed the graphics card and tried again. took out the optical drive to find incredible amounts of dust so once again blew all that out and blew air through the power supply and sent dust all over the room. plugged it back in and no result. With everything that i have read i think it has something to do with the power supply. could it also be the tiny flat battery on teh logic board prehaps short circuting the system? If it is the power supply is there just a fuse blown that i can replace? Also if i put my ear right u against the power supply when its plugged in i can hear a very very faint ticking sound, similar to perhaps the sounds ignition sparks make on a gas stove.

I dont want to take it into the shop and pay the $70 odd dollars to just have it diagnosed if it is such a simple asnwer so can anyone please please help me!!!!

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Apple Mac Pro "Quad Core" 2.66 (Original) Specs

Identifiers: Mac Pro - MA356LL/A - MacPro1,1* - A1186 - 2113


Hi there just a question did you ever fix your problem ?

Looks like I have the same problem ?

Thanks G


I'm currently having the same problem.

I plan the replace the psu and am worried about needing to use the original system disc, which I have, and I have the existing system backed-up, but what a

pain in the u. n. w.



I have got macpro a1289 8core 2.26ghz this morning my system won't power up when I plugged two red led blink once then goes off and when i press diag button it shows 5v stdby i have tried lot by removing rtc bat and pro tray but still no sign of start pls tell me what should i do is it my system back plane board problem?


On my 2006 Mac Pro no led at the on button. An audible click then another click. I did the drill left it up plugged, replaced the battery with fresh one; still the same clicks when turning on. The top 'cuda' button shows the 5vdc trickle but never turns on. I am gambling the power supply has gone south. It's possible the mobo has a failure but nothing visual like pregnant caps or burn marks. If the grease drie out on the cpu's I think it woul boot up then crash because of heat. I've removed the power supply, it's sure is dusty but does not have a burnt smell. I can get a refurb power supply under 100$us and may try that. I also cleaned the RAM and I notice when RAM got funky the LED on the on button woul blink.

Lou Cioccio


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Gewählte Lösung

To reset the SMC on a Mac Pro:

1 From the Apple menu, choose Shut Down (or if the computer is not

responding, hold the power button until it turns off).

2 Unplug all cables from the computer, including the power cord and any

display cables.

3 Wait at least 2 minutes.

4 Plug the power cord back in, making sure you are not pressing the power

button at the same time. Then reconnect the keyboard and mouse to the


5 Press the power button to start up the computer

System Reset

Mac Pro has a system reset switch on the logic board that you may use to

restart the system while it is powered up. You can use this switch to determine

if a computer that won’t consistently boot from a cold start has power supply

issues. Follow these steps to reset the system:

1 Start up the computer.

2 With a nylon probe tool, press the system reset switch located in the upper

right-hand corner of the logic board.

If the computer boots after you press the system reset switch, try shutting off

the computer and restarting by pressing the front power button. If the computer

restarts when you press the system reset switch but not from a cold start, the

power supply may need to be replaced.Let us know if you get any changes, also look at the diagnostic LEDs and tell us what you observe. Mac Pro First Generation Power Supply Unit Replacement

Apple Part Number:


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hi mayer, thanks for the reply... the computer wont actually start at all, as in nothing lights up no noise no nothing. i tried unplugging the the graphics card, the hard drive and the optical drive this morning to no result. is this a definate that that power supply is dead in the water??


At this point I would make sure there is power to the wall plug, next replace the power cord, next replace the power supply. Note you will need the original system disk to sync the fans after your power supply is repaired or replaced.


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I had the same problem with my MAC machine and tried the all above troubleshooting but no vain, I replaced the PS but problem was same,

finally I though to open the power switch connectivity. Unplug the power switch cable tried to turn the system and plug back the power cable again. Actual problem found in power switch, its dont pull back properly and switch connectivity force the machine to shutdown. you should move switch right left and updown and have light finger touch to turn on the System. Replace it with new one if your power switch hv repeated issues. Thanks

Muhammad Shehzad, PK

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kuz wird auf ewig dankbar sein.

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