System issue usually after upgrading to Big Sur, Catalina, Mojave, High Sierra, Sierra, EL Capitan, Yosemite, Mavericks, Lion or Mountain Lion.You will need to repair the DVD drive or purchase a new one in order to watch DVD movies on Mac. If your DVD drive is bad or damaged, the dvd player program will not be open. There are many reasons that cause the issue “the default DVD Player not working on Mac” in macOS Monterey, Big Sur, Catalina, Mojave, High Sierra, Sierra, EL Capitan, Yosemite, Mavericks, Mountain Lion, Lion, Snow Leopard, Leopard.
