Boot device not found

[Siena01]

Hi, 

My laptop (HP Spectre x360 Convertible Model 15-eb0043dx with Windows 11) have been giving me the blue screen of death (BSOD) stop codes like critical_process_died and memory_management and others. I tried to back up my c drive but it kept bringing me to that screen. Then after several hours, it completely says I have no OS to or hard drive to open windows. I don’t know how to fix it. Read something on the internet that my hard drive might be loose. When I go into system diagnostics, the BIOS version is 2.2.8.0 which I’m assuming is the default, but I can’t exactly do anything.

I also tried changing the BIOS settings to default, but it changed nothing. Probably reiterating what I said before, the OS boot manager could not be found or does not exist. 

Anyone have any ideas of what I can do? 

[TheOldMan]

That error typically means the hard disk is failing, but it can also be caused by something interfering with the boot process.

To verify the situation, run the Diagnostics routine.

To run the Diagnostics routine, Start tapping the Esc key BEFORE starting the PC and then press the start button.

Keep tapping the Esc key until a popup menu shows. Then pick Diagnostics from that popup menu, F2.

Report back with the results.