SPDIF to HK AVR 7200

Guys,

I hope that someone could hopefully help me here.

I have a HTPC,with ATI8500DV(with the dongle,on which there is a S/P-DIF output).

I connected this ouput to my Harman Kardon 7200 digital input,through a 75 ohm coaxial cable.

When playing a DVD in TheaterTek,I pick SPDIF as the ouput type,and the ATI cinesonic SPDIF as the ouput device.


Then,the Amp sees the signal as digital as the LED next to digital lights up.


However, the image freezes 2-3 second or so,and at the same time,I hear a "interference"("pppsssschhhittt" like) noise through the speakers connected to the Amp.

And of course,no sound or music at all time.


I do not know what to explore.The DVD player software seems to send out a digital signal through the S/P-DIF port,but the amp is not able to decode it properly..

I would appreciate a little help

Thanks in advance,