Samsung Hd Dvd No Sound After Hooking Up My Samsung DVD Player To HD Panasonic Plasma?

No sound after hooking up my Samsung DVD player to HD Panasonic Plasma? - samsung hd dvd

I bought a 42 "Panasonic plasma TV, DVD surround sound home theater aSamsung ND. But after the connection to the HDMI cable that does not always surround sound to my work. The only sound comes from the same TV. Could faulty HDMI cable? Both TV and DVD setup is correct for HDMI.