One our one DVD player will not play any disc. New, old, rental, whatever. The machine tries to load the disc and it comes up "Bad Disc". I know it is the machine as the same discs play fine on the computer or the player my kids have. Any suggestions?

Have you tried cleaning the DVD player? There are discs that will do that. I bought mine from Best Buy for about $30.00. Works like a charm and have had no problems since. Perhaps others will have some different ideas for you.