5.1 speaker with 3.5m jack to TV?

Hey Guys

I have recently bought a HD TV and DVD upscaler and now seem able to manage 5.1 sound since my new TV has 5.1 output being 5 RAC outputs labled Pr, Pb, Y, L and R. I also have a 5.1 system for my PC with three 3.5mm jacks on it, which works fine with my PC. Is there any way of hooking up the 5.1 sytem for my PC to the input for my TV?

Thanks very much for any advise :)

Kal

Sorry, i mean my TV has 5 RCA outputs

No, the sound is still only 2 channel, L & R. Pr, Pb & Y are component video.