Question PC screen goes black, fans start spinning very fast and loud

[ixheartless]

Hi guys,

I built my PC in 2018. I started having this issue last year. Sometimes during idle, my monitor will randomly go black and my PC fans start spinning at an incredible speed. It sounds like a jet engine. The only way to get out of this is to force-shutdown. It will reboot as normal, and the issue will happen once again in a few days or hours. It seems to be completely random.

My PC was very dusty so I dusted all of my components a few months ago, and the issue stopped, so I figured that was the problem. But today it happened again. My idle & gaming temps are normal. I have never tinkered or overclocked any of my components. My GPU drivers were last updated a few months ago, and my BIOS drivers have been the same since 2018. I have absolutely no clue what this could be, and I'm pretty worried. If someone could help me I would greatly appreciate it.

Here are my specs:

CPU: i7-8700K
GPU: EVGA 1080Ti FTW3
MB: ASUS ROG MAXIMUS X HERO
PSU: Corsair HX850i
RAM: 32GB
FAN: NZXT Kraken AIO\

Thank you to anyone who bothers replying!

 

[NanoSuit3]

You do know that your CPU and Mobo are incompatible right?

 

[Paperdoc]

The symptoms you describe are a complete shut-down and ATTEMPT to reboot, but the reboot fails. In the very first stage of booting all the fans are started at full speed, and then the POST process starts - basically checking all components to see they are working normally. When that succeeds the system can complete the start-up and the fan speed control system can do its thing. In your case the POST is failing - something is NOT working and it cannot complete. I can't tell you what that failure is, but it's odd because your system will reboot if you force a shut-down.

 

[ixheartless]

You do know that your CPU and Mobo are incompatible right?

Oops, my apologies. I meant 8700k.

 

[ixheartless]

The symptoms you describe are a complete shut-down and ATTEMPT to reboot, but the reboot fails. In the very first stage of booting all the fans are started at full speed, and then the POST process starts - basically checking all components to see they are working normally. When that succeeds the system can complete the start-up and the fan speed control system can do its thing. In your case the POST is failing - something is NOT working and it cannot complete. I can't tell you what that failure is, but it's odd because your system will reboot if you force a shut-down.

Hmm, interesting.

.. is this something I should be worried about? How would I go about finding out what the issue is/what part is not working properly?

I don't know if it matters mentioning, but all of the lights in my PC (RAM RGB, motherboard RGB, AIO cooler display) stay on when this happens - except the GPU's lights.

 

[Karadjgne]

Blackscreens are most often caused by 2 things, vbios issues and VRam overheating. In your case I'd suspect the latter since your statement of

My PC was very dusty so I dusted all of my components a few months ago, and the issue stopped,

would point towards that. If dirt/debris/dust is packed down in the fins, the gpu will get plenty of cooling as that's in a clear area under the fan, but the outlying components such as VRam and VRM's may not be. I'd suggest pulling the card out, taking the shroud cover off and making sure the heatsink fins are fully cleared of any debris.