When your computer is unable to boot from its primary hard drive, you can use a CD to start the computer. This is called force booting from CD. Force booting from CD can be useful if you have trouble starting your computer or if you need to run diagnostic or system recovery tools.

There are a few ways to force boot from CD. One way is to restart your computer and press the key that corresponds to your CD drive. This is usually the F8, F10, or F12 key. Another way to force boot from CD is to open the …