Hi guys I bought my Edifier M3300SF 2.1 almost 6 months ago,and I don't know if this problem existed for quite some time already or not,but I just realized that my left speaker doesn't produce sound My subwoofer produces bass and the right speaker produces sound,I can feel it with my hands,when I put my hands on the subwoofer and speakers,there's the sensation.But the left speaker,there's like nothing. Is this hardware problem or software settings?

I use on-board soundcard,Realtek HD Audio Drivers.Windows 7 32-bit.

Sounds confusing. My subwoofer has 3 output holes from the input,one for line-in that connects to the remote,L(White) and R(Red)...so I realized that when I plug my left and right speakers into the red hole,it works,but when I plug my left or right speakers into the white hole,it doesn't work.