Replacement for Memorex DVD player

First, the sound system. How many wires? Is the sound output optical, mini plug, or RCA, left and right channels? I make an assumption that the DVD is using a HDMI cable for picture/sound to the TV. Most New DVD (Blu-ray) players have only HDMI and sound output in the form of optical. Does the sound system have multi-inputs for the sound signal? If your sound system had multiple inputs you will be able to get almost any player as a replacement.