MacPro 3.1 does not start up

Thanks for this elaborate reply. I'll need a few days to digest it. But I just want to tell you that I already had that technical manual you suggested me to download. That's where I learned about the led dialogue. I probably don't have the necessary competence to find out what is wrong with my 3.1 and I am very sorry because I liked it a lot.

Thanks for trying to help me.

I thought the power supply was bad too. I used the power supply from two different working 3.1 and I still cannot get any response from the power-on button. Then I used the power supply from this MacPro 3.1 and installed it in my other working 3.1 and it booted fine. According to the manual, LED 1 indicates Sleep mode and is noramlly off when computer is not on. It should come on when computer is working. LED 2 is the power supply trickle power and it does light up when I press the LED dialogue button. LED 7 indicates present GPU. Pressing the led switch and the power on button at the same time only lights up LED 2 which tells that the power supply is providing current.

Thanks for your reply. Yes, I am sure that the power supply is ok since it works fine when I use it in a different MacPro 3.1. You mention the front panel board; is it the small piece with the power-on button?

Hi

I swapped the front panel boards and the faulty 3.1 still does not respond to the power-on button while the good computer boots all right with the board from the faulty computer.

Thanks for not loosing patience.

Trouble, trouble! I started removing the logic board from Mac Pro 3.1 #1; in the meantime, I powered on Mac Pro 3.1 #2 and the video came on and took me to the user window for a second, but then the video quit and I was left with a black screen. I shut it down using the power-on button and turned it back on. No video, no booting only a quick blinking power-on button. When I press the Led dialogue switch I can see the #2 Stby led on and the green PWRG led on. Is this another case of dead logic board?

One more precision, please. YOu are talking about a help me message. Where should I see this Help me? Not on the monitor, I assume since the graphics card has been removed.

The power-on indicator will blink If I press on it or is it supposed to blink by itself right after I removed the pcie cards and the ram? Forgive my misunderstanding, please.

Thanks

Thanks for those explanations. Can I ask you if there is anything I can do to rescue this computer or could the logic board be dead? Or could the power-on button be the culprit?

Any suggestion about what I could do next?

Thanks

Hi

Could both cpus have died at the same time?

I think I can get a replacement one. It looks like it comes with the firewire and usb ports, right?

Thanks again

Very wise advice. I will try that.

Thanks again,