I am using a Raspberry Pi Model B+ with an Adafruit touch screen monitor. When I booted, I got a display that looks like this:
The vertical lines are red, green, and blue, and the screen seems to draw more of them as time goes on. I've searched for my problem, and although I found many questions on a white screen, I found no questions on a white screen with lines on it.
The Power Good light on the monitor is on, and the Touch light is flashing. The Display Good light is not on.
I am using a screen bought in 2016 with a Raspberry Pi bought in 2014. The Micro-SD card is also from 2014 and it came preloaded with the OS. It is possible that the software is out of date.
I dropped some of the boxes on the floor at one point, but they were enclosed in bubble wrap and other protective packaging at the time, so I don't think that was the problem.