reading cd-rom with my PIONEER DVD-RW DVR-117D

I've got some trouble with cd-rom on a mono 1.8 powermac G5
The speed of the picture and the doesn't match together only on this computer ! Help.

details :
Fabricant: PIONEER
Modèle: PIONEER DVD-RW DVR-117D
Révision: B705
Type de disque: CD-RW/DVD-RW
Gravure du disque: Géré/Livré par Apple
Support amovible: Oui
Disque amovible: Non
Protocole: ATAPI
Numéro de l’unité: 0
Type de socket: Interne