Last setup I seen like that from Logitech, all the speakers were powered / plugged into the Woofer, then the Woofer into the PC. BUUUUTTTTT you needed to have mutliple output for sound (front and back). Many computers did not, so for desktops they buy a audio card and disable the onboard audio in BIOS, for laptop get a USB Audio card. Many makers realized people had more then TWO speakers, and then started to make multiple outputs on the Audio, so there was the OUTPUT port (Blue), the Headphone port (Green), and the Mic port (Red/Pink). Some went full 7.1 so they included more output ports (Yellow, etc.) for the rest of the connections. What colors do you have and what icons are over each color port on the audio connections? Did you wire the speaker into the Woofer which should be how to power the speakers?