I am trying to help a relatively computer illiterate person boot from a bootable CD. I have not seen his PC, do not know the model number and do not have access to the PC. He says that it is a HP Desktop PC that he acquired new around 6 to 8 years ago. What would be the "key" to press at PC start to access the boot menu? Is there a list somewhere that shows the various PC manufacturers and the key to press to access the boot menu and the key to press to access the BIOS? Thanks in Advance.