How to reset computer with no password?

[flipj]

I recently bought a computer from someone online but I can not reset it. I've run into a few problems when trying to reset it and I don't know what to do.-=-=-=-Problems I've run into consist of:1) “There was a problem resetting your PC”2) can't enter bios because the keyboard is not powered until I've reached the login screen3) can't access administrator cmd to reset passwords4) I copied this tutorial (

View: https://www.youtube.com/watch?v=YBFAzK9mgNI&t=476s
) but it did not work

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