I have a similar problem, it randomly start to appear color lines every once in a while and sometimes a line would just stay and the only way to get rid of it is to turn off and on the monitor, I tried disconnecting the HDMI but the line stays so I know its not the GPU. I've only been with it for 3 days and it's already giving me problem.... I contacted the seller and I'm currently waiting for a reply to return it, unless there is a fix
* Was this monitor purchased directly from Dell as new? * If not from Dell, from whom did you purchase this Dell monitor? * When was the purchase made? * What is the non-private 20 digit S/N? * What is the non-private A0x revision?
* What operating system? * What specific PC model? - If a Desktop PC, what video card? What video out ports are on the video card? - If a Laptop PC, what video out ports are on the Laptop? * Show in detail how the monitor is connected to the PC using all ports and cabling. Example = PC GTX 1080 DP out port --> DP to mDP cable --> U2414H mDP in port PC USB port --> U2414H USB upstream cable --> U2414H USB upstream port * Have you gone into the monitor Menu- Others and reset to Factory Defaults, then retested? * Run the monitor stand alone BID (Built-in Diagnostic). Post pictures of the BID colored screens