Gigabyte GA-P55-UD3L rev 2.3 Motherboard refuses to power on

Just did that. Same result.

I take it that folk that work such know to reduce the parts to as few as possible so that out of the way you swap the board.

As I already said, I did that. I rulled out the PSU, the RAM is 100% OK. What I'm not sure about is a possible short. But the Motherboard doesn't react even on a cardboard, so…?

2 parts. MB and PSU. No CPU etc? It's the board.

That's why I said "the Motherboard refuses to start". Any logical explination as to why is this happening?

Dead board. There is a circuit there but motherboard makers do not publish schematics so I have to stop at dead board. Remember I'm an electronics designer and could offer a lot more if there were board schematics. But since there are none, we can't go into why the board won't power up.

That out of the way I have to check again the CPU, RAM and all that was removed for just a board and PSU power up test. I have in the past overridden the power up circuit with the short of the GREEN PSU wire to black, but that was a last hurrah for a server while we waited for a new motherboard.

I'm definitely not going to risk destroying a PSU that is still in warranty. So, I guess the MoBo is done for…

Can you recommend another Motherboard that supports LGA 1156, preferably not from Asus? I don't need OC, but, if possible, it would be very beneficial if the price wouldn't be over $40, used of course, as it is a 10 year old socket.

I would like to keep it because I have a Xeon X3470 that I was using it with.

That's news to me. Google "Green Wire PSU test" to see how and what about that.

As to your next board, I can't guess where you shop. Newegg has a search feature that can exclude a make.

It's useless. I can already give you the results: the PSU is fine. I have already used another PSU to try and power it on. It didn't work. Also, as I said (though I didn't get into details(, there is current flowing through the Motherboard. And that means: if I connect a USB device, it recieves power. Just like that, if I connect a molex fan directly to the PSU, it spins up. The PSU is fine, that's why I actually created this question: because everything was getting power, but the Motherboard just refuses to start up. Even the Graphics Card, which needs an additional 6 pin connector for power, spins the fans up at a very slow rate when I flip the switch on the PSU.

Also, I shop on OLX. Because, in Romania, nobody sells these boards new. I can only find them used. And OLX is the only reasonable used market in my country. If you could just recommend me a board that checks the requrements I listed above, I'll do the research from there. Also, one more thing: if the board is compatible with some kind of energy saving feature, it would be great (e.g.: how ErP was for this P55 board, or how EuP was back in 2007 for some boards).

The server didn't have a backup so I was able to power it up and let it run until new boards arrived.

If it's just the power on circuit this could let you use this board as-is. I have to disagree it's useless.

As to Romania, good hunting.

How would this trick let me use the board in that state? How am I supposed to plug in the cables into the motherboard when I have a paperclip inside the connector?

As a designer, wiring up that green wire would be trivial. If this is too hard it only means you are where you are.

The green wire is the signal to tell the PSU to power up. If the section for power control is defective we override this with this well known trick.

So, you could paperclip it, or solder that pin on the back of the motherboard to a black wire pin.

Remember this is all to eek out some use before replacement.

That's exactly what I was thinking last night, but I was tired and went to get some sleep. That I can do. But can't I solder a wire to the green wire at back of the MoBo and another wire to a neighboring black wire at the back of the MoBo to connect to the power button then and power it on like that from now on?

Why can't you just explain? Don't just drop out on someone like this. It's the first time I'm dealing with board component level operations.

Unless there is a schematic we can't discuss board components and how it works.

I can however share a possible work around to eek out some use from the board if replacement is not possible today.

-> If you feel slighted, please place the ire at the makers that no longer publish service manuals and schematics.

This is what I was talking about: "That's exactly what I was thinking last night, but I was tired and went to get some sleep. That I can do. But can't I solder a wire to the green wire at back of the MoBo and another wire to a neighboring black wire at the back of the MoBo to connect to the power button then and power it on like that from now on?". It's one of my previous answers. Can you tell me if I can do that soldering?

Anyway, the board doesn't seem to want to POST, even if it powers on. Why would that be?

Then there's more wrong with the motherboard than a power on circuit.

Sorry ant but it's dead. Can't put it much simpler than that.

I know you want to repair motherboards but until makers issue circuit diagrams and manuals this is not going to happen. Even Rossmann has to scrape the net for Apple docs. Given there are some hundred Apple boards but tens of thousands of Intel/AMD boards the chances of you finding the schematic is nil.

You seem to think I dropped you. No I didn't. We went beyond what we usually do with a dead board. Now it's dead, we move on.

I didn't think you dropped me because you wasn't of help, but because it took you an unusual time period to come back with an answer. And I know how the deal goes with the schematics. I know they won't publish them.

Anyway, maybe I mistakenly reflashed the main BIOS with the backup BIOS and that one may not support the Xeon. Let's hope it's just that.

I did some searching online for LGA 1156 Motherboards, but nobody here in this PoS country sells these MoBos separately, that means without CPU or some other components and none are less than $50.

I guess, if it ain't the BIOS, I'm going to have to wait for someone to sell their LGA 1156 decent at an ok price for such old generation.

I've only done this too many times. Forgot to plug in the BIOS chip, power up and wonder what I did wrong.

-> As to response time, figure up to a day or longer as members have to sleep or go to work.

But it doesn't POST. It is actually powering on with that solder.

Only one way to tell now.

No luck. The board is dead. I'm found a H55M-UD2H alongside with some RAM (which luckily I need anyway for my HTPC) for $50. You mind if I ask if that board is any good? Does it have any common issues?

I didn't see the new reply.

As to HTPC I broke down and am going with this NUC.
https://computers.woot.com/offers/intel-nuc-kit-core-i3-128gb-ssd-tiny-pc
I have some USB HDD plugged in and it's great at 1080p playback.

Prior to this I used some 2009 Sony Core2Duo laptop.