No Sound thru SPDIF on IP35

Hi all,

I have a Technics SA-DX940 amplifier which can encode DTS & DolbyProLogic, and i have connected the SPDIF output of my IP35 to my amplifier with a TOSLINK/optical cable. I beleive I have done all the available settings, but when I try to play a DVD or a .MKV with 5.1 sound, or try to test Decoding options thru vista sound settings, my amplifier does not show any connection/decoding info and i dont hear anything... (i know that it shows a DTS or DD logo when i connect it to my DVD player, but nothing comes up when connected to PC).

Below are screenshots of all the settings i made/could find, please have a look and tell me whats wrong








If i select SPDIF at the 'AC3 AUdio Decoder' properties, the green bars in 'AC3 Filter' goes away, and i still cant hear or see any sign of digital sound on my amplifier...

any help/ideas are appreciated.

My system specs: Abit IP35, Intel Core2Quad Q9450@3,40GHz, 4 x 1GB OCZ HPC DDR2, Thermaltake QFan 750Watts, Thermaltake Eureka Case, HIS ATi Radeon HD4850 512MB, Vista Ultimate x86 SP1, BenQ FP202W , CPU & NB watercooled by Thermaltake Bigwater 735 + Additional raditor...