Weird BIOS Behaviour / PC keeps crashing

[miege]

So I have this weird problem, where my pc boots up completely normal and then at any time it will crash. This happens EVERY day. I boot the pc up, start using it (not even demanding tasks, sometimes it crashes when idling) and sometimes it crashes after maybe 5 minutes, sometimes 30 minutes, it seems completely random. When it crashes it will just turn off, like i would have pressed the power button 4 seconds and after 1 or 2 seconds it starts up again on its own. However though, then it says it has detected a boot failure.
What makes it even more awkward: as soon as I enter the BIOS and set all values to what they should be (Everything is on normal), it works ABSOLUTELY fine. No crashes at all, never! But on the next day, if I dont enter Bios and exit it by F10 and saving it will crash again after some time.
I'm pretty sure when I enter the BIOS before first boot on a day I haven't used it before, the values are all still correct, but after a crash, the actual VRin voltage is lower than what I have set it to and I have to "renew" it.

Now my specs:
I have a Gigabyte GA-Z97X-SOC, equipped with an Intel i7 4790K.
Currently I have limited the i7 to 4.2 GHz because I thought this might help (but it doesn't).
The VRin is set to 1.255V currently but I think this might not be relevant because as mentioned, it works fine after I was in BIOS.
I also have more than adequate cooling (Corsair h110 GTX with 280mm radiator, my temperatures barely rise over 70° C under full load for a long time).
I have 16GB hyperx fury ddr3 1833MHz RAM, a geforce gtx980, one hard drive, 2 SSDs in RAID 0 and a bequiet 80+ bronze 730W PSU.

I have bought all parts new.
I haven't updated the BIOS yet.

OS: Win10 64 Bit

[philjo]

This could be due to a hardware incompatibility or faulty hardware.

Try a different HDD if you can. (this happened to my dad once, where literally the HDD was incompatible with the motherboard and would system crash after 5 mins).

Also try other exchangeable hardware such as RAM (try testing the dimmslots and ramsticks individually, and running a memory test where possible.) ( mdsched.exe )

It may be a faulty motherboard if you cannot identify any other hardware as faulty.

If your tests do not reveal a fault, get in touch with your retailer and or motherboard manufacturer for help.

If you have been sold hardware that is found to be incompatible where it should have been so, you are due a replacement/swap.

Personally going by the behaviour of your BIOS, I'd say your motherboard is rekt.

I hope that helps

-philjo

[miege]

Thanks for your answer.
I will try it when I have time.
But why would it work after I was in BIOS once if the hardware was incompatible until the next day?
I never had it crash for the rest of the day when I was in BIOS.
It almost seems like some settings are not saved correctly and are lost when the computer is shutdown completely...

[philjo]

20 hours ago, miege said:

Thanks for your answer.
I will try it when I have time.
But why would it work after I was in BIOS once if the hardware was incompatible until the next day?
I never had it crash for the rest of the day when I was in BIOS.
It almost seems like some settings are not saved correctly and are lost when the computer is shutdown completely...

Good question.

This possibly points to the memory where bios settings are stored being corrupted. (CMOS) When you power on, system pulls saved settings from this memory.

You could try the following after backing up important files from your system:

Clear CMOS via 'JUMPER' method OR battery out for 1 minute. See this for how.

If nothing, then try to reflash the BIOS. Gigab has utilities for this.

If still nothing, uninstall all motherboard utilities. (small chance of conflict)
If still nothing, try a different PSU if you can.
If still nothing again, seems like motherboard is truly rekt

Again I hope it helped. Let me know cheers.

P.S. I hope someone will comment on the low Vrin voltage, could be from CMOS corruption but would like other opinions.

philjo

[miege]

Ok, thanks again.
This motherboard has even a small button for clearing CMOS so it's even easier, but i will wait until next week, until my finals are over.
Can't afford not having a working computer right now
I will let you know

 

[miege]

Hi,
after some time and different methods and many tries of fixing this here is my conclusion:
I have cleared CMOS and tried different settings in BIOS -> no change.
I have updated the BIOS to the newest version (there were like 4 newer versions than the one I had installed) -> this did solve a issue, where my Vcore for my 4790K was automatically set to about 1.45V (way to high for stock speed, i was hitting 100°C almost immediately under full load, not even with FPU testing) after the BIOS update, the Voltage was about 1.28V wich was totally ok. But the reboot issue still appeared.

I don't have a spare PSU lying around, so I couldn't test a different one, but I didn't had this problem the first few months so I think this will be more likely due to some defect in the motherboard.

So in the end I will give up trying to fix this and will contact gigabyte for help or a replacement. I own this motherboard for not even a year so it has still waranty on it. Hopefully i won't have problems anymore with a new board...