Why don't the USB ports in the back of a PC do anything?

I just hooked up my brother's Cooler Master from a few years back but only the USB ports in the front of the machine work(the ones not far below the power button). There are like four additional ports in the back though but I've tried all of them with my controller, keyboard, and mouse and none of them do... show more I just hooked up my brother's Cooler Master from a few years back but only the USB ports in the front of the machine work(the ones not far below the power button). There are like four additional ports in the back though but I've tried all of them with my controller, keyboard, and mouse and none of them do anything. Don't think it's an actual problem with the computer though because it's been kept in good condition. Are these ports meant for something else or like what?
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