vortmax

Are all 3 plugs from the speakers plugged into the sound card? Find the documentation for your card and make verify which port is which and make sure they match the cord being plugged into it.

Don't worry about digital, you don't have it (speakers anyway). It's a way to transmit the data for all 5.1 speakers in a single cord.

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Asus A7N8x delux Nforce 2
AMD Athlon 2800+ (barton core)
512 meg Corsair DDR 400
Gainward G-force FX 5200

Dell 6000i
Intel Pentium M 725 (1.60 GHz/2MB Cache/400MHz FSB)
ATI MOBILITY RADEON X300 64MB HyperMemory
1 gig DDR2 PC2-3200

Music server:
AMD K6 500 MHz
128 Meg RAM

Onkyo HT-R520 Reciever
6.1 DTS ES & Dolby Digital EX