The ASUS ROG Swift PG27AQN is an awesome gaming monitor.
How about those specs, 1440p, 360Hz, HDR 600, IPS, 1ms, the list goes on and on.
Do you need help with it or did you post it for everyone to see?
I see you're having issues with your monitor going to a blank screen.
You've tried two PG27AQN monitors and both give you a blank screen. I couldn't see you getting two faulty monitors in a row unless you are super unlucky.
Since it's happening with two monitors, it's possible some setting could be causing it or something needs updated.
I'd like to ask..
1) Have you updated to the latest motherboard bios.
2) Have you installed the latest graphics driver.
3) Have you installed the monitor driver.
4) Have you tried different cables. Displayport/HDMI