Recently I purchased a new monitor online - a BenQ 27" and although it's a great monitor, the bottom 1/3rd of the monitor doesn't seem as white as the rest. Is this a common thing with displays these days, do I have a slightly faulty monitor, or is it caused by backlight? It's not a huge variation in white, but enough for me to notice it most of the time. I'm currently running the monitor off an HDMI cable, but would a Display Port cable make a difference? Thanks