PC instantly shutsdown after easy anti cheat screen switches to the intro movie.

Don't know why it's happening but it's clearly the PSU instantly shutting down the moment the game starts for some reason. 

The odd thing is that it worked the day before.

My setup is 

5900x

6900xt

32 gb ram

m.2 ssd

Win 10 pro.

PSU Straight Power 11 1000W

Other games work fine, don't think it's overheating, something must be triggering a safety in the psu but no idea what could be causing it. 

I bought a new monitor but it worked on it the other day, the only change was that today I pluged in the old monitor for a dual setup, but also tried with just one monitor the old one too and still insta shut down.

Anyone had anything similar happen to them?