The top of the picture.  One inch down is a horizontal line and almost halfway across from that line up is a vertical line.  Now this can't be burn in - or could it?  Does anyone know what's going on here?

I've tried it with HDMI, D-Sub and DVI as well as on a different computer.  It's RUNNING at the native resolution.






 Can't say for sure if it is burn-in or not.  LCD screens are less susceptible to burn-in than CRT screens but not totally immune.  However, in the case of an LCD the burn-in is usually not permanent.Leave it a while and see if it fades.  IPS LCD panels tend to get slight, temporary burn in - I notice it on my laptop where I can see a faint ghost from previously open programs for a short period of time after closing them, it fades out QUITE quickly.

If you apply pressure to the screen (carefully!) do you get any rippling around that area?  There could be some sort of pressure point in the casing that presses against that part of the panel which can cause issues like this.  My laptop has a subtle BRIGHT spot where the touch screen controller PCB is located as this presses against the back of the screen EASIER than the rest of the lid when the laptop gets squeezed in a bag.Thanks for the response guys.  No there doesn't seem to be any rippling with it.  It has been there for a really long time.  I'm setting it aside for a while to see if that makes any improvement on it.  I'm also looking at this wondering if it will do anything other than give the dog epileptic seizures.  https://www.youtube.com/channel/UCHlPCQQG2XcFPN4jAa1QVxwPut the puppy outside before trying that procedure....