I have also just picked this monitor up so hopefully i can give you some help
My unit shipped with the power brick in the box and OCUK also additionally shipped me a seperate power brick. I'm using the extra one and not suffering any noise at all so maybe check in with them if you didnt get the extra power brick and ask if they can send you one
I've had an Acer X34 previously and this is the replacement, as far as IPS glow is concerned i think this LG is substantially better I barely notice it in normal bad situations, such as watching films and media with black borders
Here is a photo of my screen in pitch black.
https://imgur.com/GwRcAQp
And here in normal lighting
https://imgur.com/yvPSh8g
It's more difficult for me to take one fully lit but this is the best i could do ignore my shadow in the middle of the screen