Spdif doesn't work,am i wrong?

Hi i ve tried to use spdif insted of jack cables(a lot of people saying that there will help me on sound cause there is a lot of noise by using cable) but it doesn't work.
I insert on spidf out(from mpc) to spidf in (m audio fast track pro usb interface) but there's no sound coming out from my monitor also i can't export sound to my nuendo.
that means i can't work,i ve tried to understand reading the manual but there wasn't any tutorial on how it works spidf.
I bought an spdif cable(golden material) not a normal rca cables.
Am i wrong?
Another question is:the are 4 output on my mpc,how can i use them to transfer each track(i use for example track 1 drums,2 snare,3 hi hat).Right now i have to play each track and transfer by stereo out,on input of the interface and recording on nuendo,but it means i just wasting the 4 output.
Any help will be appreciated.

In your recording program, there will probably be a preference setting or option to turn on the SPDIF. I just had this same problem two days ago. I'm using pro-tools though, your situation might be different.

make sure that the SPDIF channel on your PC's sound card is selected as the recording input. also, if you want to monitor the sound from your speaker, make sure the SPDIF channel isn't muted on your playback channels.

I will try but i ve already choosen the spdif channell on Input..I will let you know,anyway if there is anyone else that use nunedo please help.Thx for now
i will let you know tonight

I susspose your problem is only in card config, i got the same issue.
try FAQ on producer's site, I remember there's few questions about spdif