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Pc to tv hdmi but no dts

my current setup is pc to led tv with hdmi.tv optical out to onkyo amp with spdif optical cabel.
Problem is the amp is getting only mono sound whereas earlier it was getting dts.for some reason it now gets onlky mono.Is ther some windows setting that can change it back to dts?
pc is win7 32 bit. 4 gb ram with intel dh67cl motherboard an i5 processor.
tv : lg 32LE4500
amp: onkyo ht-s3400

More about : hdmi dts

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