Bios failure after failed windows update

[Juantorolo]

Hi Community,

I recently acquired a Prodesk 400 G7 desktop. It came without HD so I installeda new nvme and, after reinstalling windows 11, an update started and due a power problem, system turned off while updating.

After recovering power PC did not boot after removing all peripherals and resetting CMOS, I get a beep/led code. 2 red/long beeps and 2 white/short beeps (BIOS corruption signal).

Looking around HP support page I came across a way to fix this, but it did not seems to work, I only get an black and white HP logo on screen while if booting with a USB thumbdrive connected or the beep code if no storage is attached.
Could you please help?

(Excuse my English, as I am not a native speaker)

[NonSequitur777]

@Juantorolo,

Welcome to our HP Community forum!

OK, the 2 long red beeps followed by 2 short white beeps indicate BIOS corruption, which is consistent with the system losing power during an update.

If the USB drive you are using is a Windows 11 installation USB, it will not repair a corrupted BIOS. The BIOS must be recovered before Windows can boot or be installed.

I would recommend doing the following:

1. Obtain the exact product number of your ProDesk 400 G7.
2. On another working Windows PC, download the latest BIOS SoftPaq for your specific model from HP.
3. Run the SoftPaq and use the option to create a BIOS Recovery USB flash drive.
4. Disconnect AC power from the ProDesk and remove the NVMe SSD.
5. Connect the BIOS Recovery USB to a rear USB port.
6. Hold the Windows + B keys, press the power button, and continue holding Windows + B for several seconds.
7. Wait several minutes to see if the HP BIOS Recovery screen appears.

A few questions:

• What is the full product number of the ProDesk 400 G7?
• Does the HP logo remain on the screen indefinitely, or does it eventually disappear?
• Have you already tried a BIOS Recovery USB created from the HP BIOS package, or only a Windows 11 installation USB?

If a properly prepared HP BIOS Recovery USB does not start the recovery process and the system continues to show the 2-red/2-white error code, the BIOS chip may need to be reprogrammed externally with a SPI programmer or the motherboard may need to be replaced.

Please be reminded that your PC is reporting the 2 red / 2 white BIOS corruption code, I would focus on recovering the BIOS first. A Windows 11 installation USB can reinstall Windows, but it cannot repair a corrupted BIOS. Once the BIOS is functioning normally and the beep code is gone, you can proceed with installing Windows if necessary.

Kind Regards,

NonSequitur777

[Juantorolo]

Thanks for answering!

- This is a hp prodesk 400 G7 MT with Product number 11M72EA#ABE

- HP logo stays indefinitely on screen.

- I did try HP BIOS Package after downloading it using serial number to locate the file, but in a front USB (is also directly on the motherboard) I just tried in  back USB, with the same results (none)