The rear speakers do not for my computer. I tried installing and reinstalling my sound card but it doesnt work. one issue may be that i dont have the sound card for the system itself, but then again, it did work before i reformatted my computer. the rear speakers does work, because i can switch any of the rear speakers with one of the left front speaker and it works. the problem is that i cant get them all work.

Audio Players & Recorders - Altec Lansing - ACS 56 Computer Speakers