HDMI Has No Sound

I looked at those tips.  They don't apply to my situation.  The sound works fine if I connect the cable box using composite video cables and audio cables.  Sound does not work if I use HDMI.  I want to use HDMI for the cable box because my DVD player does not support HDMI, and so I need to use the composite inputs on the TV for that.

It's a brand-new HDMI cable.  I don't have any other device that uses HDMI.

I don't entirely understand the question.  I plug the HDMI cable into the only HDMI port on the cable box.  I plug it into HDMI1 on the TV and then configure the TV to treat that as the cable box input.  I get a picture from the cable box but no sound.

Scientific Atlanta Explorer 4240HDC

Audio settings for what?  The TV does not have a setting for this.  Presumably, it is covered by setting the input to HDMI.  The "sound" settings on the TV do not relate to the input source, just things related to sound quality.  I've gone through the settings on the cable box, and there is nothing to change the output channel.

My box (Explorer 4642HDC with Rovi) doesn't have a Digital or HDMI option for the audio signal, so I assumed (I know) Davanden's box (Explorer 4240HDC) also does not.  My only setting for audio is under Audio Digital Out, which allows you to choose either 2-Channel (Stereo) or Dolby Digital.  If Davanden's settings are different, yes, select HDMI.

Prior to connecting your DVD player, why did you connect your TV to the cable box with composite cables?  Why didn't you use HDMI?

Right now, you removed all RCA cables from your cable box, right?  Is the HDMI cable is the only connection from the cable box to your TV?

I'm curious if it's an issue with content protection because you originally used composite cables to perhaps bypass HDCP (High-Bandwidth Content Protection).  But, then again, you're getting video, so I'm ensuring the video signal isn't getting to your TV via an RCA cable.  Perhaps I'm still assuming.

Thank you.  This fixed the problem.  I had looked at the options on the cable box before.  I either didn't see that one or didn't realize what it was.

--Dav

As I noted in another reply, the problem has been fixed.  However, to answer your questions:

Several generations of equipment ago (different cable box, TV, and recorder), The only way I could hook up both my recorder and cable box to my TV was by using a switcher that fed the signal of either through the same composite cables to the TV, depending on which I needed.  Because I had all those cables in place, I simply kept them as the different components got changed over the years.  Recently, I started having trouble with the video feed, and I deduced that it was because the switch box was going bad.  As noted above, my DVD recorder does not have HDMI, and so I needed to use the composite cables for that .  Thus, I decided to hook up the cable box using HDMI.  That's what started this matter.

--Dav