Try Alt-Ctrl-Del. There should be "power" icon in the lower right-hand corner of the screen.
Clicks on the power source not to demonstrate

My computer doesn't have a shutdown option.
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Rich Matheisen 38,821 Reputation points
2023-05-16T14:51:25.56+00:00 This isn't a PowerShell problem. You should remove the "Windows Server PowerShell" tag from your original post and add a "Windows 11" tag so the question appears where the subject matter experts for that product can assist you.
In brief, you can force the machine to boot into safe mode by powering on the PC, and then pushing its physical power button after the machine starts to boot. You have to do this twice Then you should see a “Choose an Option” advanced startup screen.
If that doesn't work, boot from the recovery media or the installation media.