So, when I boot my computer, once it gets to the desktop for about 5 seconds there's vertical green lines on my monitor. It will then switch to them looking clear and then they disappear. I've tried print screen to get a picture of it, but it just shows my desktop looking normal. I also tried using gifcam and it also shows the desktop looking normal. I tried different DVI cables, and using the different ports on my video card, but it's the same result. My card is an r9 290, only a month old, and my monitor is 120hz. I also have the latest drivers for my card and have my monitor drivers installed. I've tried finding anyone with the same problem through google, but to no avail. I tried a different monitor that is 60hz and everything seemed fine. I also tried setting my monitor to 60hz and the green lines didn't show up, but about 5 minutes later I got a black screen and had to power off my computer. I'm thinking my monitor is bad. It did the same thing when I used an old HD 4850 video card. Does anyone think it would be anything else besides the monitor?
edit: Tried the monitor on another computer and it didn't do it.