I've just received the 990 this morning and ran into a problem immediately - no sound came out from speakers. I hooked up preamp out to the Adcom GFA7500 (5 channels) plus the sub to SW1, configured the DVD output to COMP-DVD/Coaxial 1; Directv (video 1) to COMP 1/Optical 1. I can see the switching of video, the sound was just some tiny pings occasionally and sometimes I can hear a very low sound from the speakers.
In auto setup, I ran into a similar situation like readster posted on May 26. It said either the Mic or the speaker are not hooked up, but they are and unlike readster's situation, my AMP was trigger ON and volume was turn on loud enough, but only some low volume ping sound came out. I did try to change the speaker size to small, large ... Did try to hold the MUTE key for 5 second as Gonk suggested, it turned off the red speaker indicator on the front panel, I guessed it went to headphone then the occasional ping sound disappeared, hold again to turn the headphone off, the sound back again but there was still no decent sound came out. I am using B&W 9NTs, CDM_CNT and CDM_SNTs with Def Tech sub. I am new in posting here but have been reading this forum a lot, it is the postings from these knowledgeable people like gonk ... prompt me to buy the 990 to replace my dead Adcom 750. I hope this is just some small problem from my ignorance and could be fixed with some advice. Thanks in advance for any input.