Windows 11 after reinstall won’t start up or restart properly

[Windows Server]

If I press power button and release, pc starts up then shuts down within a few seconds.If I hold down power button, it takes me to recovery screen, says Windows didn’t load correctly. If I choose restart from the recovery screen, sometimes it gets me in, and sometimes it shuts everything down.I have already disabled fast start option per suggestions.Need it to reliably start up and restart so I can pass on to next user. Help please.

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