HP notebook computers that come with Windows 8, Windows 7, or Linux installed, use an AMI BIOS version 8 that is compatible with UEFI (Unified Extensible Firmware Interface). This version of the BIOS includes Secure Boot, which is enabled by default. Having Secure Boot enabled in the BIOS prevents legacy boot devices from starting your computer and includes bootable CDs and DVDs.
To start your computer from a valid bootable disc, such as an HP recovery disc, disable Secure Boot in the BIOS, and then use the Boot Menu to select the CD/DVD drive as the boot device. Use the steps in this document to disable Secure Boot to start your computer using bootable discs.