i have cable for internet and dishnetwork for video,i babysat each company when they installed.made sure they grounded, watched each company put on there ground straps,then made them undo it to scrape the paint off the pipe(come on i do car installs,you don't ground to paint)anyway,due to lack of spdif inputs i have to cable swap when i want to run puter audio through the system.as soon as i hook up the puter's spdif:hum,unhook it:gone.if i hook up the puter then unhook the sat. feed:no hum.can't just unhook the cables on the sat. have to actually unhook the feed.it's strange but it doesn't bother me so much that i lose sleep over it.btw,everything is on the same circuit,still no line conditioner though.

also i tie the puter in with my monarchy dip which is supposed to be a ground isolator(among other things)

john i tried the ohm converters and they worked to perfection as far as the humming noise is concerned, however i did notice a small degradation in picture quality. the tradeoff was well worth it so thank you for the info.maybe when i purchase a power conditioner the hum can be removed without the use of converters. thank again.

emile