How to repair a pc


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Hello All,
I am trying to understand how to repair a pc , what I am trying to say is let’s say the pc freezes all the time, or the its USB drive suddenly starts not recognizing the hardware that you attach to. And worse of tall the entire pc dose not booth up at all!! Is there software that can diagnose and even give you the problem and maybe the solution to your problem?
I would appreciate any and all help
Thanks again