Computer crashed and now won't boot

[Thogro]

So, i might have a problem.

Last week i rebuildt my computer to a watercooled system. Last friday i booted it up for the first time, and it worked perfectly. And it continued working until today. It simply shut down. I was rendering a video in Pinnacle Studio 17 and browsing the net when it happened. MSI Afterburner never showed the cpu cores og the gpu above 50 C during the rendering.

Here are the the facts:

When i unplug everything, the power supply still runs, so i dont think it's broken.

There is a green light on the motherboard and a light at the the ethernet port, so it gets power.

I see no signs of leaks anywhere.

I have tried removing the graphics card, but still nothing happens.

I have tried shorting the power button pins, and it doesn't work either.

MSI Afterburner never showed temps higher than 60 C, so it shouldn't be an instant overheat.

After the first crash it booted up to the login screen and then shut down again. Not been able to boot since.

My rig:

Case - Cooler Master HAF 912 Plus Midi Tower

Power Supply - Silver Power SP-S850 850W PSU

Motherboard - ASUS P9X79 LE, Socket-2011

CPU - Intel® Core i7-3820 Processor (Socket-LGA2011, Quad Core, 3.6GHz, 10MB, 130W)

RAM - Crucial DDR3 BallistiX Sport 16GB KIT

Graphics Card - GeForce GTX 780 3GB

In short, nothing happens when i press the power button

I'm not at the computer until tomorrow, but do you have any idea what might be causing this? Have the motherboard shorted somehow? Is there something else i should try? *Insert clever questions here*

[techenthused73]

 In my experience sudden shut down can very well be the power supply.  This happened to me when I had upgraded to a gtx 580 and was playing Skyrim. A sudden increase in power pulled by the video card shut the power supply off.   I could reboot the system but did not try any games until I had a new Corsair HX 1050.

 

I'd try a another or new PSU first.  Perhaps your power supply works just enough to light up the motherboard.  That is a pretty beefy system and the 780 does have power spikes.

[Thogro]

I'd try a another or new PSU first.  Perhaps your power supply works just enough to light up the motherboard.  That is a pretty beefy system and the 780 does have power spikes.

It's weird, the psu has been able to power everything and with two 780s in sli no problem. I'm still waiting for the second waterblock. Could it be the pump was the last straw? I wouldn't think so since i only have one 780 in now. And it ran a couple of days before it crashed. I will try with the psu from my old computer when i get home, but that's quite a smaller one.

Is it just a coincidence that it died right after i rebuildt it, or could it have caused it somehow?

[Thogro]

So i plugged in the main power, cpu power and the pump into my old psu, which is a Corsair cx 430, and it's exactly the same. Nothing happens when I press the power button, and a green light on the motherboard.

The motherboard gives of a faint, high pitch beeping sound when powered and it changes slighty when i hold in the power button. I fear more and more that the motherboard might be dead. Any mpre ideas?

[adhisakti]

So i plugged in the main power, cpu power and the pump into my old psu, which is a Corsair cx 430, and it's exactly the same. Nothing happens when I press the power button, and a green light on the motherboard.

The motherboard gives of a faint, high pitch beeping sound when powered and it changes slighty when i hold in the power button. I fear more and more that the motherboard might be dead. Any mpre ideas?

 

Try to unplug everything from your motherboard, take it outside the case and turn on your system by connecting the power pin, maybe your case power button is broken or there is short circuit somewhere

[Thogro]

Try to unplug everything from your motherboard, take it outside the case and turn on your system by connecting the power pin, maybe your case power button is broken or there is short circuit somewhere

I wonder; will the motherboard "boot" without a cpu, gpu or ram plugged in? if i take it out and connect it to the psu, will the little speaker beep to signify a boot? There is no onboard graphics on the board

[adhisakti]

I wonder; will the motherboard "boot" without a cpu, gpu or ram plugged in? if i take it out and connect it to the psu, will the little speaker beep to signify a boot? There is no onboard graphics on the board

 

turn on yes, boot/beep no, you need at least working cpu to your motherboard make any beep sound. if you can borrow some pci diagnostic card its easier to detect what is going wrong