My Logitech speakers stopped working.

Hello,

My Logitech speakers have been working fine since we've got them. I was gone a couple of days, and I think my younger brother may have had something to do with it, but when I came back the speakers wouldn't work. Turning the speakers on high, I realized that there were no sound coming out of these at all. Not even a white noise or a static or a buzz. Nothing. So I checked all the cords to see if they were plugged in and in the right place and everything. They were, and I am clueless. I tried checking the internet for an answer but none of them pertained to exactly what I needed so here I am. Help would very much be appreciated :) Thank you.