Fan starts then stops

No matter, as soon as the PC powers on, all the fans spin, and some stop depending on the processor management. And even on some "desktops," it’s enough just to plug it into the power outlet for them to spin and stop, WITHOUT having turned it on, and by the way, the power supply fan starts "up" right away".
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How will you respond to a question when you don't know the answer? He talks about the fan that starts quickly and stops ("fan starts quickly and stops"). Unless you're clairvoyant, you can't know which fan he's referring to, since there isn't just one fan in a PC. So it's not "whatever."

I simply replied that when the machine is powered on, there is definitely a fan that runs, and it's not based on which one that you will "guess" the problem.

In the description of the problem, he described the fact that ONLY A CERTAIN fan starts and stops MEANS that the machine starts up and shuts down IMMEDIATELY. AND THAT'S WHAT I INFERRED!!!

And I have not yet given ANY ANSWER to his problem, EXCEPT to "provide some elements" of possible failures following this kind of reaction.

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