i've got an lcd tv with 1 hdmi input. my hd cable box has only a dvi output. i've got a dvi to hdmi cable for video and rca cables for audio. my tv has setting for that so it is working well for me.

i want to add an upconverting dvd player. i have purchased a 2 way hdmi switch. 1 for the tv and 1 for the dvd player. my question is if i have the tv set up to receive sound from the rca cables (video is thru dvi to hdmi cable)... how do i hook up the sound thru the other switch from the dvd player that is hdmi to hdmi?

you will also need to have a switch for the audio if your tv has only one input. most people use a home theater receiver with multiple audio inputs. many also use a receiver with multiple video inputs, which gives you the switching too. many newer receivers also feature hdmi switching, and even up-conversion of analog video to hdmi.

you can use a hdmi switch that has built in rca stereo routing.
most hd dvd and dvd players and settops have l/r stereo also ,so you can connect all the video to this switch with hdmi/dvi, and all the stereo l/r audio . then connect the outputs to the hdtv and sound via l/r audio output.