My first guess is that there could be an issue with the dvd or the dvd drive being dirty. What happens with:
1). A different dvd?
2). No dvd?
3). Try a cleaning dvd if it does not matter which dvd is in the drive.
That will narrow down at least where the fault lies dvd or dvd drive.
2018 Pacifica Touring L
18 in Wheels
No matter where you go there you are!