It is showing that boot device not found I'm trying to solve it but not it was not solved

[Vy-0919]

I was using HP laptop I was trying to on the laptop but it is showing that boot device not found please solve my problem 

[BeemerBiker]

Have you run diagnostics?
Tap the ESC key after powering on and press F2 to run diagnostics.
Do not allow any updates if disk or memory fail, especially a BIOS update.

If you cannot pass disk diagnostics then the disk needs to be replaced.

If the disk is good then windows startup needs to be fixed and you do that by trying to booting into safe mode.

This explains how to boot into safe mode
https://support.hp.com/bg-en/document/ish_5000477-5000532-16

Skip down to "Enter safe mode from outside windows"

When you get to advanced options select "Startup Repair"

Let me know if you need more help or if startup repair fails.

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