cyberelectronics

I just got digital cable set up today and the receiver will play all my speakers and surrond sound when I play CD's or DVD's but when I switch to cable only the right speakers work and not the left but the center channel works still! I use the 5 Channel stereo and in the book it doesnt say anything about this! Do you know how I could get all 5 speakers working at the same time? Let me know [email protected]

thanks