✔ 最佳答案
1. Make sure that the BIOS of your notebook is set for such function.
Once your computer is turned on, keep pressing F2. After that you will be able to change the boot setting.
(Please refer p. 77 of your user manual.)
2. Make sure that your DVD is bootable (not all DVD are bootable).
Once you are done, you should be able to boot your notebook by using the DVD.