The boot is not normal, but it will be fine after a while. This is why there is a cooling fan in the chassis. At present, the motherboard of the new machine can adjust the voltage of the cooling fan according to the use of hardware such as CUP by software in the computer. The fan speed is high when the computer is busy and low when the computer is idle. At first, due to the system startup, software loading and other factors, the computer runs at full load, so the voltage and speed of the fans reach the highest, and some fans with low quality will make noise when the lubricating oil is not fully lubricated. After the machine is started, it enters a relatively idle state. On the one hand, it reduces the rotation speed of the fan, on the other hand, it is basically fully lubricated, so the noise is small. If you turn it off and turn it on again, the abnormal sound should not be too obvious in a short time, but it will be obvious when the interval is long.

Solution: The fundamental way is to see which fan is abnormal (mostly cup-shaped fan) and change it-no matter how high the speed of high-quality fan is, there will be no big abnormal noise; Another idea is to reduce the burden of machine startup, slim down the operating system, reduce unnecessary startup items, and choose antivirus software that takes up less machine resources. In this way, your machine can be started lightly and this problem will be alleviated.