So my refurb 24" ACD was delivered about an hour ago. I set the desktop to all white and hid the dock to check it out for defects. Well, lo and behold I found one. It's pretty annoying and I'll be returning the display. I guess I'll try for another refurb and if that is defective I don't know what I'm going to do. Here's a picture I took of it with my iPhone. Is there anything I can do about this? It doesn't appear to be lit up. It almost looks like dust or dirt or something.