Burned DVD's won't play on set top player

My Apex DVD player says no disc when I try to play DVD movie copies I burned in DVDFAB 5. Yet I am able to play them in my liteon. I have tried 3 different brands of DVD and have used two different DVD writers. My friend burned a DVD for me in DVDFAB 5 and it plays fine. We bothe used the Main Movie setting. Ant thoughts please?