只要开机，电源风扇就会一直在转。
A PSU (power Supply Unit) fan is always running when the computer it powers is on.
正确的开机顺序是先开启扫描仪的电源，然后再启动计算机。
Boot order is correct before the power to open the scanner, and then restart the computer.
解决的方法是断开电源一会，重新开机即可排除。
The method is to cut off the power supply for a while and restart the machine.
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