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Slow BIOS start after BIOS update

HP Recommended
EliteDesk 800 G2 TWR
Microsoft Windows 7 (64-bit)

Hello everyone.

I have recently updated BIOS for EliteDesk 800 G2 TWR from version 2.05 to 2.36.

After this update a new bug/annoyance was introduced.

BIOS loading times are monstrous.
After turning the PC off, it takes about 80 seconds to show a prompt on screen ( a little blinking dash ).

After next 35 seconds there is a BIOS screen with motherboard manufacturer and info so I can enter boot device or BIOS setup.

After next 80 there is Windows screen that the system is loading and from that screen it takes another 5 seconds before the Windows login screen is available.

In total it takes 3 minutes and 20 seconds on a fairly decent machine from pressing power button to user login form.

I tried restoring the old BIOS but it tells me that there are restrictions for that whereas there are none.

I tried restoring factory defaults in BIOS but to no avail.

I have even tried removing motherboard battery but it failed again.

Those boot times are weird and were only introduced after the BIOS update.

Do you have some tips for me?

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Message 2 of 3
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HP Recommended

> I tried restoring the old BIOS but it tells me that there are restrictions for that whereas there are none.


Some of HP's BIOS-updates add code to restrict the loading of any older version of the BIOS.


Turn the computer off.

Disconnect the power-cord.

Remove the side panel, to expose the disk-drive.

Disconnect the "data" and "power" cables.

Replace the side panel.

Remove all USB devices other than the keyboard & mouse, e.g., memory-stick, scanner, printer, webcam.

Reconnect the AC power.

Reboot, and measure the same timing-points that you have documented.

Obviously, the computer cannot boot from the disk-drive.

Tell us the results.


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Message 3 of 3
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HP Recommended

On other HP equipment many had a similiar problem after BIOS update. Disabling security TPM in BIOS seems to be the fix so long as you're not using bitlocker.

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