Why did my windows boot fail while it was running?

[karl1poiss]

HelloI was just playing a video game, while all of a sudden my pc went blackA few seconds later the monitor turned back on with a text saying that the boot failed and that i needed a recovery diskI hit continue and then it prompted me with a boot manager screen, with Windows Boot Manager completley goneIt seemed to be fixed after i simply powered it off and on agianI have experienced similar issues for a long time where the screen goes simply black, but nothing like this, so i wanted to know what just happened and what should i do to prevent this incase it happens in the futureI have a Lenovo

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