i think you might have solved your problem by now but still consider this as just a little piece of info which i happen to know! As mentioned above you will need to make sure that your BIOS is set to boot from a cdrom (set your first boot device to cdrom) . also burning at slower speeds does help because it avoids buffer underrun errors ( personal experience
) and also double check the source by trying out a simulation( in nero) or trying it out on a r/w. goodluck!! c ya!!