Question Red, green and pink pixels/ symbols on monitor then pc shut off

Dec 21, 2019
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0
10
I7-7700k
MSI Z270-A PRO
Geforce gtx 1080ti inno 3D
32gb hyper x fury ddr4
Kingston 220gb SSD
Bluetooth 4/ wireless card
3tb hard drive
Water cooling

Was chatting in discord and downloading a game from steam when these Red pixels/symbols appeared on my monitor then it said no signal for a few seconds then came back on as normal.

Then about 30 minutes later these pink and green pixels/ symbols appeared on my screen and my computer shut off then turned itself on. Nothing is coming up on any of my 3 monitors just black screen.

Have disconnected each monitor and plugged each one in yet nothing. I have disconnected my SSD and hard drive and booted it up but nothing has changed. Have also tried the motherboard video ports and also nothing. If anyone can help that would be great!