Desktop computers make a certain amount of noise and light during operation. Unless you’ve custom-built a monster gaming machine with awesome obnoxious lighting effects, these are probably limited to a power indicator and a drive light. You can turn your computer off, of course, but if you’d prefer to let it run without the lights (like if you’re using your PC in a dorm room or studio apartment), it’s easy to turn those lights off for good.
Source: How-To Geek
