I have used this monitor and recently one pink vertical line appeared on my monitor. It comes and goes, but is very annoying. I know it's not the cable, I've used it on my PS4 HDMI cable, tried it on another cable and it worked. And I purchaced a brand new Mini displayport to HDMi cable for my macbook and it still has the lines. However, if I switch between the two HDMI ports 2 times they go away? Very confusing and annoying. Any ideas?