Pc keeps restarting every 10 sec and never boot to bios

[Troublemaker06]

Hey everyone

So last week, I went to bios and did a bios update not online but from storage and seems to find a newest bios version. I decided to download it and waited, after that a message told to not interrupt to process and the computer will turn off and on several times i just need to wait. So ya i waited for like an hour and half and i knew something is off i unplugged and plugged it again and ya here we are a boot loop

[BeemerBiker]

Have you run diagnostics?
Tap the ESC key after powering on and press F2 to run diagnostics.

Tap the ESC key about once a second after you see the LEDs on the keyboard flash until the menu with F2 comes up
Do not allow any updates if disk or memory fail, especially a BIOS update.

can you pass diagnostics?

There are several versions of the 800

Please provide the Product ID  for better assistance. Preferably the full product ID including the characters after the # symbol. This code may be needed to find cloud recovery files.. 

[Troublemaker06]

I can't tap on anything, the LEDs on keyboard never lighten up, even the mouse. It's like it never detected anything. it only detected  the Hard disque. Nothing showed up on screen.

It's an HP EliteDesk 800 G2 SFF and for the products ID : L1G76AV

It's all happened because of updating the bios version. 

[BeemerBiker]

try bios recover using the "B" method

HP support video for bios recovery

Click here to see how to recover your BIOS.
Do 1, 2, and the first part of 3.
For the second part of 3 you will need a USB flash drive and possibly an
older BIOS if the recent BIOS caused the problem

For laptops, step 2 "CMOS reset" there is no cmos battery nor cmos switch and no need to open the laptop. Use the Windows key + 'v' as explained here.

[Troublemaker06]

I forgot, it's a desktop HP EliteDesk 800 G2 SFF so no it's not a laptop. Also i tried these methods before except the USB recovery method which i can't make one because i don't have other computer and how to get old bios version? I remember that before the problem happened it was using a bios version of 5 juin 2016

[BeemerBiker]

Go here and expand revision history

https://support.hp.com/us-en/drivers/swdetails/hp-elitedesk-800-g2-small-form-factor-pc/7633277/swIt...

I did not see a June 2016 release.  Pick an older one that makes sense .  For example, 2.45 version actually fixes a few real problems.  Just do not pick the last one as that probably caused the problem.

[Troublemaker06]

Alright i took the 2.22v since it was the one using it before losing it

So what's next? How I'm gonna make a usb recovery? I don't have another working computer.

All i have is a phone and I really need a computer to work with.

I found that buying another motherboard will fix but which motherboard gonna fit on this computer?

Thank you very much for your instant reply never had such a service like that.

[Troublemaker06]

I wanna add something else, sometimes when i turn the computer. I hear some combinations of beeping, 2 longs beeps (2 reds), 4 shorts beeps (4 whites). What does it mean?

[BeemerBiker]

not good

Click here for AIO or desktop codes

The red light blinks twice, and then two, short white light blinks (2 long red, 2 short white)

This condition indicates that the main area (DXE) of the BIOS has become corrupted and no recovery binary image is available. It can also occur when updating the BIOS.

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You cannot recover using the win + "B" but possibly you can boot the USB  that has the old bios.   That was the second part of the 3rd step I wrote about here

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If that does not work then you need to replace the bios or flash it using a CH341A programmer

as described here .  it is a long read unfortunately.  Any good shop could to it.