PC shuts down exactly after 1 hour 54 minutes

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Padster1

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Jul 10, 2013
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Hi, so I built this PC recently out of some components I had already and some new components. The specs are:

Intel Xeon X3440 not oveclocked with a stock intel heatsink
MSI R9 270
ASUS P5Q57-M DO Motherboard
500GB Seagate Pipeline (refurbished)
Aerocool 500W Integrator 80+ Bronze (brand new)
8GB Micron 1333MHz

I was planning on using this for some light GPU mining on the side but I noticed it would shut down after a few hours. To troubleshoot I left it idling with nothing running and it would still shut down after a while. I tried to take out the GPU and while I couldn't see anything on the display because it has no integrated graphics, it still managed to turn off after a few hours.

One thing to note is that the PC usually shows a flashing power LED light after turning off on its own which apparently means it is in sleep mode but I have disabled all of the sleep modes.

Everything has always been completely clean with no dust whatsoever. I've replaced the thermal paste on the CPU and added an exhaust fan. I even left the side panel off and pointed a big desk fan at the case and kept everything at around 35C but it still turned off after a while.

Things I've done so far:
-Reinstalled Windows 10
-Changed all of the power settings to 'never' and turned off fast startup
-Replaced the CMOS battery / Switched the jumpers
-Updated the BIOS
-Changed thermal paste
-Kept temps at 35C
-Checked for any damaged capacitors (none are damaged)
-Checked bios and tried changing suspend modes to S1 and S3 (no option for off)


At this point I have no idea if it is software or hardware because I've tried basically everything that I could find software related and as for hardware I decreased the load substantially and kept the temps really low.

I'm quite desperate a this point as literally nothing I've done has helped so any suggestions are GREATLY appreciated.

Thanks for reading!


**UPDATE**
I just ran the PC for a while without any hard drive to test whether it was the OS causing it and it shut down again. This must mean it is hardware/BIOS related.

**SECOND UPDATE**
Just tested the PSU with just a fan connected and managed to stay on for ~3 hours. Now testing the system without RAM.

**THIRD UPDATE**
PC just turned off after 1h 54 minutes with no RAM in it, exactly the same amount of time as I recorded yesterday when doing tests.
 
Hi

I once had to sort out a laptop which shutdown after 255 seconds from power on

Is the shutdown period exactly the same each time?
.
If so some sort of bios count down timer is shutting down the system

When reseting the cmos the mains power must be disconnected
Leave reset jumper for a minute before returning to run position
Then power on go into bios and load bios defaults and reset date / time etc

If that does not work try a new or different motherboad

Regards
Mike Barnes

 

Padster1

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Jul 10, 2013
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It is usually around 2 hours, only timed it exactly once and it was just under 2 hours. I already disconnected the power and resetthe CMOS with the jumper and the battery.
However I just disconnected eveything from the PSU except for a fan and it managed to stay on for about 3 hours. This leads me to believe that it is not the PSU but the motherboard, RAM or CPU. Hopefully it is the RAM as this would be the cheapest fix as LGA 1156 motherboards are pretty pricey nowadays. If not then I'll try and sell the motherboard and CPU for parts.
Thanks
 
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