What is the key to press on an HP Proliant DL580 G5 to bring up the menu option to select the device to boot from? I am trying to boot off the CD, I tried F12 which didn't work.

I am trying to (re-) install Windows 10 Preview on my HP Stream 11 laptop, and somehow I am unable to make the machine boot from USB. I have created the Win10 USB stick using both the Microsoft ...