Post the Monitor, OS, Video card, Ports tested, and Issue

(1) Did the monitor pass the Self Test? (Y/N)
- Turn off the monitor
- Unplug all of the monitor video cables from the back of the computer video card
- Turn on the monitor
- The floating red/green/blue/white dialog box should appear on screen against a black background

(2) Provide the following information in your post -
* Monitor 20 digit Serial PPID number =
* Monitor ports tested =
* Video card and ports tested =
* PC Model =
* Operating System =  
* Have you updated the video card driver? If not, load the latest video card driver and retest
* Is the monitor listed in the Device Manager under Monitors? If not, load the monitor driver and retest