system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why did computer cases and monitors change from being beige/white to being black?
gpt
For the first decade-ish of PC's existence they were considered serious machines meant for business and utility. If you had one at your house at all it was it shoved in your home office or somewhere else out of the way. 

Thanks to the Internet and some other things, the culture changed: computers weren't just serious business anymore - now they were also for entertainment and recreation. People started putting them in their rooms, their dens, etc.

Around that time the marketing departments of the various computer computer companies realized they might be able to get a leg up on competition if they started making their computers pretty as well as functional. And just like that the clunky beige boxes started to be replaced with sleek, darker designs. 

TL;DR - Computers let their hair down, finally the quarterbacks noticed them and asked them to prom.