PC shuts down itself after few seconds

[NoobishSVK]

Hey. I have an X58 Motherboard with a Xeon CPU.

Here's what happens: (please note that it's a breadboard build)
- If I start the PC with one stick of RAM, CPU and 8pin ATX cable, the PC shuts itself down after 2 seconds or so
- If I start it without the 8pin connector, the motherboard works, but I can't get to the POST screen (that's obvious, right?)
- If I start it without the CPU but with the 8pin connector, same thing happens as mentioned in step 2.

Yes, the CPU is installed correctly and the heatsink holds its position.

Motherboard speaker just clicks. The PSU looks fine since it starts the motherboard and it gets a voltage.

CPU: Tested Intel Xeon X5570 and X5670 (both do the same)
Motherboard: GA-X58-USB3
PSU: Fortron Hyper 700


This first occured when I exchanged my CPU for the X5670.

Thanks for the help.

 

[NoobishSVK]

update:

tried out a new power supply, the same thing happens as with the previous one.

 

[gijoe50000]

So I've two things to say.

First: Is it a Gigabyte board? A lot of Gigabyte board have a bios issue where the bios gets corrupted and it goes into an infinite loop with a 'ticking' sound. It's not from the speaker but from somewhere on the board. In my case removing a stick of ram and rebooting usually gets the dual bios to kick in and load onto the first bios chip, if not then a bios reset usually does it. Or you could just update the bios if you haven't already.

Second: I had the same issue twice in the last year of shutting down after a few seconds, and the problem was that my 24 pin was loose the first time, and I just reseated the 8 pin the second time, and all was good.
That said, the shutting down problem was obviously a power issue both times, so maybe have a look at the power headers and see if they're damaged, wet, corroded etc. Maybe have a look at the back where they're soldered too, and see if there's a short or a crack...

 

[gijoe50000]

Just another note on the bios idea: Usually after a bios update the pc will reboot a few times, sometimes just for a few seconds each time, it's possible it was a failed bios update or a failed bios rollback from the second chip, and the update is incomplete/corrupted.

 

[NoobishSVK]

Thanks for the info. unfortunately the motherboard was short circuited.

Thank you for the help tho.