Why is my computer not booting from a CD?

Check the BIOS settings: Go into the BIOS of your computer and check the Boot Order to make sure the CD/DVD drive is listed and prioritized above the Hard Disk Drive.
Check the CD/DVD: Make sure the CD/DVD is in good condition and that the information is still readable.
Check the CD/DVD drive: Make sure the CD/DVD drive is functioning properly and hasn’t become damaged over time.
Check the disk type: Determine what type of disk is being used in the drive to see if your computer supports the disk.