Several years ago, purchased 5.1 Monsoon MH-505 along with a (at that time new) Dell XPS, Pentium 4, 3.0ghz, w/1g mem, Radeon 9800, SB Audigy 2, and WinXP. Only had about 60 hours use when I became bed-ridden and have been using a laptop since. Yes, they sat unused for about 3 years. Recently thought of selling both, so hooked them up, and the sound was still great ... ran them for about 20 hours, all was well, then, all of a sudden, the sound was gone. Hooked up an old set of Altec Lansing desktop speakers and they work great, so it has to be the Monsoons, not the SB Audigy 2. 1) Yes, power lite is on (green) on the "Surround Sound Control Module" 2) No, get no sound via headphones connected to the "SS Control Module" 3) Yes, have run all diagnostics on both the soundcard (just in case) and the speakers, 4) When I play a random sound bit (mp3/wav) on the desktop and unplug/plug-in/unplug/plug-in the "SS Control Module", I do get connection (statickie) sounds thru all speakers. 5) Have them set-up as analog in all settings. Decided to reformat the hard drive and re-install WinXP, all updates, all drivers, etc. --- connected the old Altec Lansings and they work --- connected the Monsoons and got the same as above. Any ideas? Help!