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IF you performed a clean install of 7 without the Vista drive plugged in and saw 7 load up the drive is considered a bootable stand alone by itself. Different bios versions are used by each manufacturer where the arrangement of options can also be a bit different depending Award, Phoenix, AMI, or another bios used.
The user manuals are generally your best reference for going through the various options in the bios setup. Most boards often used by HP however are Asus models where the F4, F11, or F12 could be the choice. By going into the advanced section in the bios and disabling the HP brand logo screen the assigned keys should be displayed on the black post screen as you watch the memory total being counted and the drives being listed during the initial post tests.
On desktops with Asus boards F8 is generally the key assigned for bringing up the boot device menu that gives you the option for booting from a floppy, optical, or hard drive even usb flash drive on most newer bioses. Under hard drives all drives installed are listed. On the Gigabyte board in use here however once you select hard drive from the menu a second screen shows the hard drives installed.
In the bios for setting the default hard drive you will need to go through the boot order, Intergrated Periphals if seen, and possibly another section depending on the layout until you are in the onboard configuration area that also shows a hard drive item. When highlighted that should bring up the list of drives. The boot order is a different section entirely from the one you want.