How to restore boot ssd?

Question

Do it yourself

Windows 10 blue screen crashed last night Kernel ntoskrnl.exe is missing or contains errors 0xc0000221
Changed PSU
Now it says Disk boot failure , insert system disk and press enter
How to fix?

Answer 1

1) Check the power and data cables
2) Check the BIOS settings, a full reset may be
needed 3) If possible (the easiest option) - check the disk on another computer

Answer 2

Reset BIOS. Why did you change the PSU with a blue screen? If the screw is screwed up, then it's a pity for the degree.