Screen dimming for a second then blacking out

[DarkSliders]

Hi!
If my description of what it looks like is weird, there's a video attatched at the bottom
My screen has been blacking out/switching off for varying lengths of time.
Sometimes it dims for a short second before it turns off.
I'm using a HDMI from my on-board hdmi port, since I use four different screens.
The system still detects the scree
For the other screens I'm using different ports on my 1080.

If I enter the Intel Graphics Control Panel and change the resolution of the screen, it switches back on, and it also does when I switch it back to 1080p. The time it stays off or on seems completely random (hours even, I've just watched movies on the other screens)
Sometimes it'll switch on and off perhaps 10 times in 10 seconds, and then it'll stop for a while. Completely random it seems.

Any clue as to what might be the problem?

Video: https://youtu.be/BRdNACcxliQ

Specs:
CPU: Intel i7-4790K
GPU: MSI Geforce GTX 1080 Aero OC
RAM: Kingston HyperX Fury Red 1866MHz x2
PSU: Silver Power SP-S850 850W PSU
MB: MSI Z97 GAMING 3 (MS-7918)


EDIT: Logged on today (the 15th) and it happened once, and I changed my resolution to get it back, and then I changed my resolution back to 1080p. Nothing has happened since.

 

[rgd1101]

full system spec? include make and model of the psu

 

[DarkSliders]

full system spec? include make and model of the psu

Sorry for the late response.

Specs:
CPU: Intel i7-4790K
GPU: MSI Geforce GTX 1080 Aero OC
RAM: Kingston HyperX Fury Red 1866MHz x2
PSU: Silver Power SP-S850 850W PSU
MB: MSI Z97 GAMING 3 (MS-7918)

Guessing my hard drive isn't that important when it comes to this