I have had a set of Creative speakers for quite a while now. They work perfectly on all my other computers (iMac, and a couple of HP desktops). I just received a new computer (Lenovo Y40), but when I plugged the speakers in, I heard a buzzing sound. My speakers and laptop were plugged into the same outlet, so I tried switching the outlet for the speakers. the buzzing was still there. What I discovered was that the buzzing would only occur while my laptop was plugged in. No matter where it is plugged in, the buzzing will only appear if I have my laptop plugged in, along with my speakers.