Hi, all I new in this great forum. I just bought AV with digital and coaxial digital out, and I'm using digital fiber from DVD to AV, last night strange cracking sound come out from speaker, the I unplug the digital cable from AV and plug it back after I switch back my AV no sound is coming out from speaker. Now I swish back to coaxial cable, any help please. Thank in advance. Sorry for my English grammar.