Hello Lalala, I would recommend you to test the system with minimal configuration but out of the chassis. Please connect the motherboard, processor, power supply, 1 memory stick and video card.
What we want to check is if any device is causing a grounding issue on the system.
Start adding one component at the time until you find the conflicting one.
If the issue persisted, you may want to swap the motherboard if possible.
thanks for your answers. I know what you suggest is the standard troubleshooting procedure. But as I've told, the issue appears randomly and sometimes after days without any trouble.This would mean a big effort finding the reason of the trouble.
And to be honest I am also a bit tired of deconstructing and constructing my system once again because of trouble with the Mainboard. I have two systems equipped with the DX79si and the i7-3930k (all other components are different) and I've had to change both Mainboards after they have roasted themselves and my RAM (no overclocking!). I've never had so much trouble with a Mainboard so far and there were a few into the last 15 years.
My momentary solution is that I've plugged a switch in the power socket which I use to disconnect the Computer from power easily.
If somebody knows a more elegant way to solve this problem, please tell.
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I don't want to point this at you but have you considered the fact that maybe the problem is from your electric current. Especially the x79 series are very sensitive to electric fluctuations. To brick two boards & the third is on the way. It says there is something wrong.
I personally had some problems with my x79 both the Asrock & the Intel one. Until I got a good UPS "something like APC with good protection". Clean power source from the outlet that is shared with nothing & a proper grounding is very necessary.
Thank you Ziad Aghar, that could be a reason. Although, before I ran two
Core-2-Quad-Q6600-machines (Asus- and Gigabyte-board) on the same power source without having any trouble. Anyway. I'm gonna try this. The effort seams to be low - beside money.
By the way, for about 2 weeks I cut the power after I shut down the computer and I have no problem anymore. Maybe this information helps somebody to have an idea what causes the trouble.
I also had a Q6600 on a Gigabyte MB . Now it's sitting on the balcony doing nothing lool
It worked well on my old generic UPS. Ever since I assembled an X-58 system & now the X-79 I realized these specific electric issues. Especially, given that you are using a high end PSU which draws lots of power "especially on startup".
A good brand name UPS with good protection "doesn't have to be too fancy", & proper grounding is always a step in the right direction, even if it doesn't solve the problem.
After disconnecting the power from the PC, does it boot normally remembering your BIOS settings??