DVD player keeps looping on intro but never gets to menu page

Discs load fine, and then play the intro (the bit you cannot skip through) But never goes to the menu, just repeats this part indefinitely. At the end of each play of this, I see a small rectangle for a split second before it starts repeating. It is a Lowry. Have had them before with no problems. DVDs without these intro work fine (even +R/+RW). Sorry wrong make, but Lowry was not on the list. Thanks