No signal to monitor after “unoverclocking” CPU [Solved]

Jun 9, 2018
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Monitor no signal, could this be a psu problem?

Specs:
-Windows 10 home
-i7-6700k
-Asus Z170 Pro Gaming/Aura
-4X 4GB DDR4 RAM (compatible w/ motherboard)
-850W Corsair psu

Story
I built this PC for Christmas in 2016, there were no problems with it until about a few month ago when I got my first crash on Overwatch.

I didn’t think too much about it and just launched the game again, with no issues. As time went by the game crashed more and more often, from the first occasional crashes to one per gaming session to one every half an hour until I couldn’t launch the game without crashing. Along with windows blue screens w/ error code different every time.

I contacted Blizzard, the company who made overwatch, they told me that razer synapse was the issue and told me to uninstall it. I uninstalled all razer software and used the repair option for the game, the issue appeared to have went away.
(Also keep in mind that a few weeks later I was playing Overwatch, same settings, on a i3 HP all-in-one desktop with razer synapse. 3 hours a day for 5 days, not a single crash)

So I went on a camping trip and came back 2 days later, launched overwatch, and it returned to the state where crashes happen every hour or so. Blue screens everytime.

Then it happened.

Minutes after I start my pc, it would blue screen without me doing anything. I contacted Microsoft and they instructed me to update windows to the latest version/build. Then my pc could start, when it was “fixed” I decided to unoverclock my cpu, ever since my pc was built I had it overclocked at 13%. That day I set the clock speed back to its default, 4.0 GHz. Restarted the computer.

No signal to monitor

I tried resetting motherboard memory, testing ram sticks, shipped my motherboard to asus for repair(come back with “symptoms could not be replicated”) and now I’m here.

Could this be a psu problem? Should I test the psu next? And if it’s faulty, should I replace it with the same model or a different one? What should I do differently to make sure this doesn’t happen again?

Psu model - https://www.amazon.com/gp/product/B00OVCJKWC/ref=oh_aui_search_detailpage?ie=UTF8&psc=1

My theory
Assuming it’s a psu issue, and that my psu is rapidly deteriorating. It explains why at first, crashes only happened when running cpu intensive tasks such as overwatch. Becoming more and more frequent until there wasn’t enough power to supply the entire pc, causing a crash, w/ random error codes. Uninstalling razer softwares frees up some power, but not much. Then to where I could start it, but the startup applications take too much power. Windows update with bug fixes? I dunno. Then where there wasn’t enough power to start the machine, but still enough to light up the motherboard and spin the fans.


Update June 17: Issue has been fully resolved, 8-pin atx power connector was disconnected and I did not plug it in after Asus returned it. Prior crashes was probably an unstable oc and the no signal was resolved by resetting the bios
 
Jun 9, 2018
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4Ghz, typo

Error codes were different everytime, one I remember was system_memory_exception
 
Jun 9, 2018
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Tried removing CMOS battery from motherboard

I did not send my cpu with the motherboard, they explicitly stated to not do that

I did overclock it ~13% but I did it with AI suite 3 which stress-tested the cpu but yes it’s between the psu and the cpu.
I was just wondering if it’s definitely one or the other


 
Apr 13, 2018
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Did you try reseating/exchanging the RAM for a similar known good set?
 
Jun 9, 2018
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I’ve tried reseating them and tried booting with just one of the four sticks. But haven’t swapped them out for other ram.
 
Jun 9, 2018
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I solved the signal problem

Short answer: I’m a moron and forgot to plug in the 8-pin atx power cable after I got it back from Asus

Long answer: I’m a mentally retarded idiot who skips the most basic checkups and moves the blame to other components



That’s technically the complete solution to the title of this post, but I’m still clueless as to how the crashes and blue screens happended. The first no signal was probably just a oc failture and needed a bios restore, which I don’t think I completed fully before I shipped it to Asus. Then after I got it back I didn’t plug in the 8-pin atx.

I just got it boot up tonight but I have to sleep now, I can do more testing on it tomorrow and come back with updates. Meanwhile any ideas on how the crashes could’ve happened?
 
Jun 9, 2018
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Did some play testing and no more crashes! Assume it was just an unstable oc so i’ll leave it at 4 Ghz for now.

Got my 1070 ti mounted today and no problems.