Q: like, a website that just blinks black and white.
A: I'm not sure if there's a website that can turn your monitor into a strobe light, but I know there's a program that can do it. It's written in visual basic and you might have refresh issues, especially on an LCD monitor, but it's worth a try. Here's the link: http://users.oeccwildblue.com/computerguy/programming.htm