HP Z840 no USB support at BOOT

[Airborne9521]

Hi,

        I am having this problem and I am not sure when it started. When I boot the HP Z840, there seems to be no support for USB ports. Meaning USB keyboard and mouse won't work untill OS has booted. Could it be a setting in BIOS? If I connect the USB keyboard to a USB port on a card, then the keyboard and mouse works.

Thanks.

[DGroves]

if you or someone else has played with the bios settings then yes it can disable the USB

unless you are using specific pci-e cards such as video capture or audio processing or gpu compute then you simply reset the bios back to FACTORY defaults

shutdown, remove power cord, press power button till front light/beeping stops, open side cover

press cmos reset button for 5 sec

reinstall side cover, power cord, and power on, enter bios set time/date

only change these settings (optional)

onboard nic(s) boot, set to disable 

onboard LSI boot rom set to disable,  do not disable the LSI device......... only the LSI  boot rom

devices attached to the LSI sas/sata ports will still be seen/work only the boot ability is disabled

Intel AMT, disable (found under the SECURITY SECTION) AMT allows remote access to the system and has known security issues and is useless unless your system connects/is connected to a domain controller

do not set/enable "AMT" password, if you do and forget it there is no way to recover password so if enabled write password down and tape it to the inside cover........ again the AMT password unlike the BIOS password can not be recovered

Never ever set the PCI-E "compute"  to enabled as it disables the video in/out of any video card installed in that slot

this setting is only used in specialized cases

the two Intel SATA III 6GBps ports require no drivers, the 5 intel "SCU" sata ports next to them do require the INTEL RSTe drivers "e"=Enterprise these enterprise drivers have specific support for the z820/840 chipset and can be found on the HP website

[Airborne9521]

Hi,

      that solved the problem. The culprit seems to be secure boot.

Thanks.

[Airborne9521]

What does secure boot anyway?

[DGroves · Accepted solution]

secure boot makes sure that the boot sequence is checked/verified at various points in the booting sequence via checksums which prevents non authorized things from running

https://neosmart.net/wiki/boot-usb-drive/