No audio

Here's what I'd do:

Determine if the DVD player is in fact outputting sound by:
-Plugging the DVD player in to a couple TV's with as many RCA cables as you can

See if TV is accepting RCA audio:
Try anything else you have with the RCA cables (other DVD players, old VCR, Headphone -> RCA adapter (then you could use an ipod/computer/whatever to output a good sound source))

Also, I know with a lot of HDTV's you have to push the cables in pretty hard.

yeah sometimes we all get fustrated with stuff like that, the trick is not to hit the thing with a hammer,,

any way ensure that yougot the cables connected propperly in the L/R audio output from the dvd player (RED AND WHITE its alo labeled) and connect it to the in in the tv..

check your player settings (audio settings and and check your tv audio settings to ensure they match) some HDTV's only use 5.1 or higher

if your dvd remote got a volume controll on it ensure the u\volume is all the way up and that it isnt muted.

try your player on a next tv to ensure its working , if it is the problem is with your settings as stated above