Change the computer's startup sequence to boot from CD/DVD. To do this, you must enter the computer's BIOS configuration utility. Start up the computer. When you see the prompt "Press F2 to enter Startup," do so.
Once in the configuration utility, navigate to the Boot Sequence screen. Use the arrow and enter keys to make the CD/DVD drive #1 on the list, if it isn't already. Save your changes and exit the utility. Start up the computer.