Connect the main speaker cable to the green port. Easy to plug into the wrong one especially if you are color blind. Use a flashlight to distinguish the colors. Look up the connections in your manual.
not an answer to this old post, but I have the exact same problem now. Unplugged system to move it a short distance then plugged everything back and No Sound. Tried every combination of pins to jacks, usbs to ports, etc. Nothing. Just posted my problem to the forum and waiting to see if it gets approved. wish me luck.... sure hope you are good to go with sound.