I have two. One has a bad burnin problem. It takes 30min to set and the rest of the day I see that original image. The other has a weird color wave. I used to

I have two. One has a bad burnin problem. It takes 30min to set and the rest of the day I see that original image. The other has a weird color wave. I used to buy an iMac 27 so I could have a great first screen. I’d like to go back or have an apple monitor again.