No boot-options shown in F9 BootMenu

[Stims]

Hi,

I bought 2 SanDisk SDCZ73 -064G USB-sticks mainly to boot ISO files.

The bootable USB is created with Rufus and mostly formatted as MBR UEFI / CSM NTFS bootdisk.

In the BIOS SecureBoot is disabled and UEFI Legacy is enabled.

When I press F9 to open the Workstation's bootmenu, i get an empty bootmenu, with no items shown.

However the boot-options are present, but not visible.

I can use the arrow-down key to guess and select the bootable USB and then press Enter to start/load the selected boot-option.

The bootable USB is then loaded and executed without any problem.

When the USB is empty and formatted FAT32, the USB drive is shown in the BootMenu, together with all other normal HD, CDROM boot-options.

Tried with BIOS versions 2.54 and 2.58 with no result.

Why are the boot-options not shown when the bootable USB is plugged in?

[itsmyname]

@Stims --  

1, formatted as UEFI / Legacy NTFS bootdisk 

2. When the USB is empty and formatted FAT32

Could the difference between the NTFS file-system and the FAT32 file-system be causing the motherboard to not recognize the NTFS-formatted volume?

[Stims]

The problem is with "bootable" in the HP BootMenu

USB Non-bootable FAT32 or NTFS is shown in the BootMenu together with the other boot items.

USB bootable NTFS shows an empty BootMenu, but the USB boots and loads when selected "blind".

[DGroves]

insert USB key, then in rufus "Boot Selection" select FREEDOS, Partition Scheme MBR, target system BIOS (or UEFI)

file system FAT32 if under 32GB,    NTFS if greater

[Stims]

BootMenu visible and FreeDOS boots with FAT32, MBR, BIOS (or UEFI-CSM)

Rufus doe not support FreeDOS MBR,  BIOS (or UEFI-CSM), with File system NTFS.

BootMenu does show USB and other boot-options when USB is formatted as a MBR, NTFS, not-bootable datastorage

it also appears that the HP BootMenu does show boot-options when UEFI-mode is disabled in the BIOS.

Same Sandisk USB-key tested in a Lenovo laptop bootmenu without any problem.

Also other brand USB-key tested in HP Z440 bootmenu without any problem.

When I change the bootorder in the BIOS to USB first, and reboot, the USB boot, load and execute without any problem.
This way I can bypass the HP BootMenu