1. Try a headphone to the green jack or other speakers. Any change?
2. Now here's a problem. NO STANDARDS in controls but some have a left right balance slider. Since there is no standards I fish around for that and move it to the center position.
I have a GATEWAY desktop computer and the speakers have been working fine up until now. Now the right speaker and the woofer are working, but not the left speaker. I don't have the manual for these Koss speakers. I bought them about 3 years ago from The Source because they are sort of futuristic looking. The two little speakers are round and the woofer is oval shaped on legs. On the CPU, there are three coloured holes, pink, blue and green. I have one cable put into the green hole. Is this correct? I believe all of the other end of the cables are in the volume control correctly. I downloaded the latest AC/97 Realtek update from CNET and it didn't make any difference. I have checked the sound control and effect and everything seems to be fine. Any thoughts on why this right speaker doesn't work. I appreciate any help you can give me and thank you.

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