Question Start loop

Jan 21, 2024
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My pc starts up and immediately goes to automatic reset. It won't let me enter safe mode, there is no backup points. I went to the c prompt and done scannow it found files damaged and repaired them and told me to restart pc. I typed in
"Shutdown /r /0 and got a message saying shutdown not recognised (or something like that) anyone have any ideas or suggestions? Did I type shutdown correctly?