Whenever i have a bootable USB pen plugged at boot the screen freezes on the black screen with
"press ESC to pause startup",
regardless of the boot order i choose. the bootable usb was pre tested on other hp pavilion dv6 working as expected.
i had this issue with windows 7 64 bits and have it with windows 8.1
i have updated the BIOS to lattest version (F26). Tried several guides for the boot menu options and nothing works.
Help is greatly apreciated