Strange way my PC keeps dying on me

linpagla

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Jul 17, 2008
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I'm running a basic PC with AMD X2 CPU on an old Gigabyte GA970A motherboard, and 4GB RAM, with an R9 380x 4GB GPU and a 750watt bronze PSU, for simple ethereum mining.
So as you can guess, the PC runs 24hrs to continue mining.
For last few months, it's running fine, but last few days, it just dies randomly, and doesn't switch back on, even when I press the power button.
I opened the system, unplug and plug the connectors back, and it comes back alive, but again dies sometime after few hours; no fixed pattern. It's been 3-4 times like this and everytime after fiddling with the connectors, it comes alive again, and runs smooth for few hours, before dying suddenly.
I checked the PSU itself with the shorting green-black wires technique, and it seems to be fine. So my doubt is on the mobo now. Heat is not the issue, as I've 5 fans on the Cooler-master casing in addition to 1 on CPU and 2 on the GPU itself. The temperatures are well in control, inside the box.

Any ideas what can I do to monitor, when and how the system dies?
 
you can’t just assume psu is working properly just because it turns on at non loading condition.

it sounds like an overheating issue, either in your power supply or mobo/gpu vrm. i was say, try clean your interior and psu with can air and make sure the psu fan is working properly run hardware info to see if you have any vrm heating issues.
 
I also want to add....you don't want to just check the voltages on startup. You want to monitor them and see what they do.

What could be happening is a component is heating up and you might see the voltage slowwwwly drop. Once it gets to a certain point....bam....your system quits.
 

linpagla

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Thanks for the replies. Im using a software called Open Hardware monitor, and here's the voltages as per the report on it... Does anything look unusual?

+- Gigabyte GA-970A-DS3 (/mainboard)
| |
| +- ITE IT8728F (/lpc/it8728f)
| | +- Voltage #1 : 1.416 1.416 1.428 (/lpc/it8728f/voltage/0)
| | +- Voltage #2 : 1.476 1.464 1.488 (/lpc/it8728f/voltage/1)
| | +- Voltage #3 : 2.256 1.98 2.304 (/lpc/it8728f/voltage/2)
| | +- Voltage #4 : 1.644 1.644 1.656 (/lpc/it8728f/voltage/3)
| | +- Voltage #5 : 1.968 1.968 1.992 (/lpc/it8728f/voltage/4)
| | +- Voltage #6 : 1.176 1.176 1.188 (/lpc/it8728f/voltage/5)
| | +- Voltage #7 : 2.22 2.22 2.232 (/lpc/it8728f/voltage/6)
| | +- Standby +3.3V : 3.384 3.384 3.408 (/lpc/it8728f/voltage/7)
| | +- VBat : 3.288 3.288 3.288 (/lpc/it8728f/voltage/8)
| | +- Temperature #1 : 44 38 45 (/lpc/it8728f/temperature/0)
| | +- Temperature #2 : 46 43 53 (/lpc/it8728f/temperature/1)
| | +- Temperature #3 : 44 42 51 (/lpc/it8728f/temperature/2)
| | +- Fan #1 : 5921.05 5672.27 6308.41 (/lpc/it8728f/fan/0)
| | +- Fan #2 : 1061.32 936.2 1069.73 (/lpc/it8728f/fan/1)
| | +- Fan #3 : 1153.85 1138.28 1161.79 (/lpc/it8728f/fan/2)
| | +- Fan #5 : 1383.2 1333.99 1409.19 (/lpc/it8728f/fan/4)
| | +- Fan Control #1 : (/lpc/it8728f/control/0)
| | +- Fan Control #2 : (/lpc/it8728f/control/1)
| | +- Fan Control #3 : 100 100 100 (/lpc/it8728f/control/2)

And currently, the PC has been running overnight, without a hiccup. I've started logging the voltages every minute now, lets see if there's any drops in the voltage over a couple of hours.
 

linpagla

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I've done that. All is clean and temperatures (as I mentioned) seems to be in control. GPU temperature is also maintained at max 70-71 Celcius during peak mining load, which I believe, is not too high.
 

linpagla

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Well, it happened once again... All of a sudden, the PC just went dead, and won't switch on... I just unplugged the 24pin connector on motherboard, plugged it back it, and switched it on, and it's running since then.

As I had set the sensor logging every minute in the open hardware monitor, I checked this log and drew a chart based on the readings, to see any variations in voltages of temperatures.

As you can see, there's absolutely no such variations in either voltages or temperatures, before the crash. This is so frustrating indeed. Can you think of any other reason for this behavior?
 

linpagla

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Yeah, I was finally able to get hold of another PSU, and found the same behavior repeating... so basically the Mobo is the culprit/victim.
Changed the Mobo, got another used (much newer) MSI 970A-G43, and it's running fine for 2 days, without any issues.
Thanks for all the help, guys!