Originally Posted by Appzalien

If your monitor is an LED flatscreen, try checking where the power plug goes into the back of the monitor. Since they almost always plug in upwards, they have a tendency to work themselves out if moved around. Also check where the plug goes into the wall or power strip and see if its nice and tight, if you use a power strip and it were loose at the wall, I suspect other things would be interupted as well. I had a monitor that would show the little green light which meant it was on but would not show a post screen. When I fully seated the loose power in the back the post screen came back. For some reason it had enough power to light the little light but not the back light.