i dont really understand the question…
Without running diagnostics, there is no way to know. The diagnostics might be extremely complicated because of the millions of components that can be extremely tiny.
I ran into a PC many years ago that kept shutting down after being turned on for a couple hours. It turned out that the motherboard had to be forced slightly into position when the system was built because the mountings were just slightly positioned off of their proper locations. The slight bend in the board was enough that heat expansion would change the shape so that one component would be shorted out.
Fortunately, the voltage at that point wasn’t dangerous; but it was enough to trigger the shutdown.
There are simply too many possibilities to answer the question.