Boot device not found

[niconiller]

I have a pc that shows the boot device not found error when booting (after 2 to 10 boots, it will sometimes turn on just fine) 

I have also had the Kernel Security Check Failure.

I have also experienced the Video tdr failure 

Please help

[Fanordi]

Hello, I recommend to you execute an hardware test in your computer. For this, restart your computer by tapping F2 when it is been down for restart. You come in HP Hardware Diagnostic Interface and can execute all tests. If you have a fail please tell us. 

For more information about HP Hardware Diagnostics please see this: 
https://support.hp.com/us-en/document/c03467259

[niconiller]

the second drive (samsung mzvlw256hehp-000h1 256gb) said not available dont know if this is a problem? but the other drive passed the test

[Fanordi]

Hello, it is possible because your system is probably on this disc.. I recommend to you begin by backup all your datas and create your recovery media with HP Recovery Manager (if never created). 

[niconiller]

can you explain this in more details please?

[Fanordi]

Hello, your solid state drive is faulty, so if you don't want loose your datas on your SSD you need to backup it on your other hard drive, or (the better) in an external drive, by copy/paste. 

And for reinstall Windows if you need to replace the SSD, you need use the software HP Recovery Manager if it is on your PC to create an external media to reinstall Windows. 

[niconiller]

so you would suggest a hardrive replace on the ssd?

[Fanordi]

Hello, for begin I recommend to you install the last version of HP Hardware Diagnostic and retry the test:

https://www8.hp.com/fr/fr/campaigns/hpsupportassistant/pc-diags.html?jumpid=va_r602_us/en/any/pps/pl...

If you have the same error, and if you have backup all your datas and created your Recovery kit, you can maybe replace your SSD. How old are your PC? 

[niconiller]

i think it is from 2017 and i can not test the ssd drive, because only the second drive shows up in the hp diagnostics 

[Fanordi · Accepted solution]

Hello, so your computer is not warranty, and if your SSD don't appears it is probably dead. If you have backup your datas and create your recovery kit you can buy a new m.2 PCIe NVMe SSD, with 256 Gb of storage or more, same this: 

https://eu.crucial.com/eur/en/ssd/series/P1?cm_re=ssd-category-_-hero-_-eu-p1-brochure-shop-now