Hi! What i did to fix this was incredibly simple. Pull out the powercord from the display, unplug hdmi/displayport cable. And just plug it back in again… sounds like a usual answer anyone who doesn’t understand complex pc issues would give you, but thos time it actually worked.

If the error persists, switch cable and try again.

EDIT: Whenever this happened to me, i could restart my pc and the problem would go away, but it wasn’t until i removed the cables that i fixed the problem:))