Summary
The following instructions will be helpful if you’re trying to startup your HP Pavilion laptop computer to USB.
Configure for USB Startup
Follow these instructions to configure for USB startup:
- Startup the computer.
- As soon as the computer is starting up, while the screen is still black, quickly press F10 repeatedly to enter the BIOS settings menu (this may be F2 or F6 on some computers).
- Select the Advanced tab.
- Arrow down to highlight Boot Order and press Enter.
- Use the F5 and F6 keys to move items up and down. Place the USB item at the top.
What is the boot order?
When the computer starts, the system BIOS begins to check a pre-determined list of drives and devices that may contain an operating system such as Windows. The computer can boot an operating system from a hard drive, floppy drive, CD or DVD optical drive, USB storage device, or a network. The order in which the devices are checked is configurable through the BIOS setup menu.
What is the default boot order?
The default boot order settings for the computer are configured in the factory. The default boot order for HP notebook PCs is listed below.
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Floppy disk drive
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Optical drive (DVD, CD-ROM)
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Hard drive
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USB device
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Network adapter
Reset the boot order to the default settings
To reset the boot order to the default settings, follow the steps below.
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Turn on or restart the computer.
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While the display is blank, press the f10 key to enter the BIOS settings menu.
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Press the f9 key to reset the BIOS to the default settings.
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Press the f10 key to save the changes and exit the BIOS settings menu.
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Some of the above information was from an HP support page.
Iowa City Technology Services 
But you didn’t mentioned the option when you quick want to choose which bootorder to boot without entering bios.If you click the button a special screen appears and you will chose instantly without entering bios. Voila !!!