Yes.
There are a number of different ways that computers can cause cancer. The first way is through the use of a CRT display, which stands for cathode ray tube and uses an electron gun to project images from the inside panel onto a phosphor screen. It shouldn't come as too much of a surprise to hear this, but CRTs emit radiation all time long while they're turned on. They also produce X-Ray radiation when they're turned off by giving off electrons that do not have enough energy to hit the phosphor screen and create visible light or harm it in any way but instead penetrate out into space where their minimal power still makes them hazardous to anything close enough over time - including you! CRT...