How to Boot Up the HP Pavilion Machine From the CD
In order to have your HP pavilion boot a CD at startup, you will need to make the appropriate settings in your computer's BIOS (Basic Input Output System) menu. By setting your CD-ROM to have first boot priority, your machine will look to the bootable CD before attempting to load Windows from the partition on your hard drive. You can change the BIOS settings and boot your HP pavilion directly from a CD in under five minutes.
Place a bootable CD into your optical drive, then close the tray.
Restart your computer.
Hit either the "F1" or "F10" keys to be taken to the BIOS setup screen when the first Hewlett Packard screen appears.
Use your right or left arrow keys on your computer keyboard to scroll to "Advanced."
Use the up or Down arrow keys on your keyboard to scroll to "Boot Order," then hit "Enter."
Go to "Boot Order" options, and select the first boot device, then press "Enter."
Select "CD-ROM" as the desired device to boot from first, then press "Enter."
Press the "F10" key on your keyboard to save the settings changes and to leave the BIOS setup screen. Your HP Pavilion will restart itself, booting from the CD this time.