From: http://h30434.www3.hp.com/t5/Desktop-Operating-Systems-and-Recovery/Booting-from-a-CD-or-DVD-with-HP-Pavillion-p6-2260ea-desktop/td-p/1878281

i haven't quite figured out how it all works, but what I do is start the PC and at the beginning of 
the HP welcome screen, I tap the F9 key to launch the one time boot menu.
 
Then I select the drive I want to boot from off the list that shows up.
 
If the F9 key does nothing for you, then do the same thing, but instead tap the ESC key and then you will see a F9 boot options menu (amongst other menu options) which you can select from there.

From: http://h30434.www3.hp.com/t5/Notebook-Operating-System-and-Recovery/What-is-the-System-Information-shorcut-key/td-p/2383287

Function + Esc = System Information

From: http://www.800-numbers.net/hp/

|=HP Business Care | 800-334-5144
|=HP Total Care | 800-474-6836
|=HP Shopping| 866-625-0242


Consumer Technical Support: 1-(800)-474-6836, (1-800-HP INVENT) (24/7)
(HP & Compaq Consumer products:Pavilion, Presario, G-Series, DeskJet, Photosmart and 
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Also: http://www.support.hp.com/us-en

From: http://www8.hp.com/us/en/contact-hp/business-support.html

800-334-5144

From: http://www.support.hp.com