Sounds like the DVD lazer may have either become dirty or faulty and only works intermittently,if it plays cd's ok then it may just be dirty but as you say it wont play films either it sounds like the Lazer has failed.
Fujitsu Lifebook P727 laptop review
11 best portfolio websites for designers and artists
Office for Mac buying guide: Price, Office 2017 rumours & new features
Comment désactiver les programmes qui s'exécutent au démarrage de Windows 10 ?