That's the Windows sign-in screen, not Safe Mode or the desktop. The blur is applied to the background picture; turning transparency off won't make your desktop icons appear before you've signed in. Your photo shows no account tile or password/PIN box, which is the part that needs investigating. Next time it happens, try Ctrl+Alt+Delete once before restarting and see whether the sign-in controls appear. If not, Win+Ctrl+Shift+B can reset the graphics driver; the screen may flicker. Also, does this only happen after Shut down and powering on, or can it happen after choosing Restart too? That distinction would help narrow it down without another Windows reinstall.