CPU fan spin for a second then turn off immediately : repaired part 3

hello friend here discuss how to repair Hp desktop cpu fan spin for a second then turn off immediately problem. first of all this problem happen for motherboards shorting.its can be for moisture. also for any component shorting problem. so at first clean full motherboard with thinner or sprite . then try to find out faulty component. remove 4 pin atx connector. after removing press power botton. if cpu fan is spinning continuously faulty from vrm section. check vrm section or if fan spin and then off then check full motherboard.
thanks

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