yes, probably the boot options are not set right ...
turn on/restart and you should see the option "press (key on the keyboard) to enter bios" or something like that and
then navigate to the boot priority or boot options and set your cd/dvd reader on first place (so it has the primary priority) then save your settings, exit and it should automatically restart and boot from device that is on the first place in boot priority.
(dont forget to press any key when prompted or else it will ignore the cd and boot from the secondary device)
Thank you very much. problem has been resolved.