Have you changed the BIOS option to start the booting from CD ROM ?
Try this link
http://h20000.www2.hp.com/bizsupport/TechSupport/Document.jsp?objectID=bph07145#bph07145_disc
For boot from disk first you have to set first boot device option in BIOS.
for that when you power up the computer press F1 or F2 or "del" key to enter in bios.
Then go to boot menu then set first boot device as your cd/dvd rom.
then save settings then insert recovery diks in rom then check.
Then it boot from disk if your disk and cd.dvd rom works fine.
Let me know if you need more assistance.
Thanks.
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