Vista and Surround Sound L/R not working

[NiteMare]

I have installed the latest Vista drivers/utilities for my Asus P5B Deluxe motherboard but my 5.1 surround sound is not working properly!

I cant get any sounds to come from the speakers that Vista shows in the L or R position

In 5.1 mode the speakers that are physically in the L/R position give no sound but the C, Sub, SL and SR positions work correctly.

If I change the settings to 7.1 then the speakers that are physically in the L/R position give sound as the SL/SR speakers and what was the SL/SR speakers give sound as the RL and RR speakers!

Under no combination do I get L or R sound and as I assume this is where the bulk of sounds are directed would explain why i'm not hearing a lot!!

Any suggestions?

 

[NiteMare]

Tried setting the 'Speaker Fill' option and now I can play CD's etc but main sound comes through the center speaker, nothing through L/R speakers and some support sound from the SL/SR speakers!

If I use 7.1 mode then the main sound still comes through the center speaker and i get supporting sound from the other four speakers!!

 

[NiteMare]

SORTED - The lights not very good in my room so I had the lime front speaker cable plugged into the grey side speaker port as I expected the connections to be in a line.

I discovered this error when I fell back to the last resort and looked in the manual!

Turned the speaker fill off now as seems to be working fine.

Thanks for your suggestions anyway.