HP 800 G3 Elitedesk won't boot

[kike50]

Hello, after reinstalling computer with windows 10, and enabling legacy and disabling secure, when restarting it does not boot, the LED is flashing with white light slow flashes and it does not start, I cannot reach bios and I do not know how to recover it.

I removed the battery for 30 seconds to reset bios but it does the same thing.
Any help please?

[erico]

" enabling legacy and disabling secure"

When considering making those changes in BIOS there is a warning that comes on the display that says that making those changes may result in a PC being no longer able to boot up.

I suggest powering on the desktop and at the same time hold down the Windows key+ the B key for 40 seconds or more in  an attempt to recover the BIOS.  Do not release the Windows key of the B key until you see a recovering BIOS message onscreen.

There is no guarantee that you will be able to recover the BIOS. You may have bricked your desktop PC.

"I removed the battery for 30 seconds to reset bios" That does not reset the BIOS if you do not hold down the power button for about 60 seconds.

More resources are in the document at the link below.

https://support.hp.com/us-en/document/ish_3966820-3438449-16

[DGroves]

A slow blinking white light on your HP desktop's power LED,

especially if accompanied by no boot,

usually indicates a hardware issue, potentially with the CPU, motherboard, or RAM

Power reset your desktop computer

Perform a power reset (or hard reset) of your desktop computer to clear information from the computer memory without erasing personal data.

1. Turn off the computer.

2. Disconnect the AC adapter.

3. Disconnect all nonessential peripheral devices, such as printers, scanners, external hard drives, and USB flash drives.

   Note: 

   Do not disconnect your mouse, keyboard, or monitor.

4. With the AC adapter unplugged, press and hold the power button for approximately 15 seconds.

5. After you drain the capacitors, reconnect the AC adapter. Leave peripheral devices disconnected.

6. Turn on the computer.

7.  

Identify the desktop light or beep code

https://support.hp.com/us-en/document/ish_1997210-1528385-16

[kike50]

Thanks Erico, Dgrove for the directions.

Tests carried out, pulse power, pressing the keyboard widows+b, and release power(I keep windows+b), the computer does nothing, it is a minute or so with the power LED and the flashing begins.

I remove the battery, and maintain power for 30 seconds, to reset bios and start again..., the equipment when turning it back on has the same result, it turns on without giving a video signal and a minute later the slow flashing with white light begins.

At no time do I have video output.

Any other possible bios reset in another way in this model?

Thanks again for the help

Is there a way to factory reset bios in a "mechanical" way in this model?

[erico]

Years ago HP provided information about motherboards that showed where BIOS reset jumpers were located.

Unfortunately that is no longer the case.

The only other option would be to replace the BIOS chip with one that has a fresh BIOS ROM file programmed into it.

[DGroves]

if you want to try, there are usb based programmers

that can be run on another system and connect to the

problem system's motherboard  corrupted bios chip

using a cable and special clip that connects

to the bios chip soldered on the problem motherboard

Here's one kit that has what you will need

https://www.ebay.com/itm/355860983884?chn=ps&google_free_listing_action=view_item&srsltid=AfmBOoot82...

however considering the cost of the programer/cable/bios clip/your time

it's usually more cost effective to simply replace the motherboard

or the entire system

https://www.ebay.com/sch/i.html?_nkw=HP+800+G3+Elitedesk+motherboard&_sacat=0&_from=R40&_trksid=p233...

[kike50]

Thanks to both of you for the help, I'll keep trying to figure out how to fix it.

I don't understand why, by setting legacy disable and securde disable in the BIOS, it reboots, asks for a code, I enter it, and I lose full access to the PC.

This has never happened to me before, and I've reinstalled many, many PCs...

[DGroves]

i don't think your understanding,

the slow white light usually indicates a hardware issue 

or bios corruption

you have either a failed motherboard or power supply, ram, cpu

or a corrupted bios

also this is the first you have mentioned the system asking for a code?

do you mean it boots to the bios prompt

and then asks for a access code to continue? (IE-readable text on screen)

if so then the HD/Bios may have had a password enabled on it

[kike50]

NO, I'll explain the process for this computer.

This computer was running Windows 7 Professional 64-bit.

With Acronis, I recovered a Windows 10 Professional x64-bit image by formatting the data on the same hard drive (I booted the computer with f9, selected flash drive, and created a TIB image using Acronis).

After booting the computer after cloning, it stayed on the HP Sure Start screen and did nothing else.

I restarted the computer again, pressed f10, entered BIOS, selected legacy disable, and then HP Sure Disable. I restarted the computer. It asked me for a manual code, which is what it does when you select those options. I typed it in, rebooted, and from that moment on, it wouldn't boot again, even pressing f9, f10, or anything else. It just kept blinking the white LED slowly.

[DGroves]

based on your description it appears that your image is a non working/booting image

furthermore it appears that trying to install your image you corrupted the restore image partition on the disk

reset your system to defaults by removing the cmos battery (or jumpering the cmos reset pins for 15sec)

then use another system to download the  HP 800 G3's "cloud recovery image" to restore a factory win 10 image

https://ftp.hp.com/pub/caps-softpaq/CloudRecovery/crsupportedplatform.html

https://support.hp.com/us-en/document/ish_4511095-4511141-16