I don't know how to get them work, the marantz setup menu drives me crazy. I've them connected by digital coaxial cable (1/8" miniplug to RCA) and there is 2 channels only all the time even I have by pass all the internal decoders (DD, DTS, AC3, etc) and only use S/PDIF in AudioHQ and WinDVD in the PC, I can't select the surround mode in SR7400 AMP mode, it is all blocked just showing *** on screen. I have my PS2 connected to SR7400 thru optical cable under DVD mode too, it sounds great, has 5.1 channel active and I can switch all the surround mode but when I set the PS2/DVD/Dig.optical 1 to PC/DVD/coaxial 4, always 2 channel, and can't switch surround mode. Also under which mode should I connect to the PC with by coaxial, TV? CD? DVD? Tape? DSS? CD-R? Please help. BTW, my marantz can boil eggs.......