Every new Apple product launch is followed by posts by a few people discovering quality control issues with their new device. I know it's rare but I'd like to check mine for defects when I get it. Curious to hear from others' experiences what some good things to check for are and how to check for them. Things that come to mind: Dead Pixels: Download a series of solid colour images from the web and display them full screen (e.g., in Photos) and check for any black dots (dead pixels). Backlight Bleed: Download and display in full screen a solid black background and set display to max brightness. Check for any glaring issues with uneven backlighting around the edges.