Desktop fan starts and stops

After turning on the computer, check whether the Num Lock light on the small keyboard is on. If it is not on, it may be caused by poor contact of the memory module. You can pull out the memory module after shutting down and unplugging the power cord. , use an eraser to wipe the gold finger, and then insert it into the memory slot (or replace the slot, or test one by one), or replace it with a stable memory.

If there is no problem with the memory test, but the CPU fan still stops and turns down, check whether the host power supply is Good, it can be confirmed by replacing it with another new power supply.

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It is certain that there is a problem with the pc power supply. The output voltage is unstable at startup and does not reach or exceed the standard voltage. The overload or no-load protection inside the power supply is turned on. This is usually caused by the serious leakage of the electrolytic capacitor at the output end to ground. The leakage is too fast after charging, and repeated It takes multiple charges to reach saturation.

The power supply is damaged and the power does not match the host. You should consider replacing the power supply. In addition, the power-good signal of the power supply is abnormal. If there is no P.G. signal or the P.G. signal timing is incorrect, the motherboard cannot work. At this time, the power controller on the motherboard will not power up the CPU, memory and other devices.

Power Good signal is referred to as P.G. or P.OK signal. This signal is the "logical AND" relationship between the DC output voltage detection signal and the AC input voltage detection signal. When the power is turned on, if the AC input voltage is within the rated operating range and the DC output voltage of each channel has reached their minimum detection level (for example, the 5V output is above 4.75V), the P.G. circuit issues a "power supply normal" message. signal (P.OK is high level), the motherboard will power up the device.

If you have strong hands-on skills, you can try replacing the electrolytic capacitor of the power supply output, or directly change the power supply. Problems with the power supply will affect the life of various accessories.

Some computers have intelligent fans that turn on to cool down. When it detects that the temperature is high, it will automatically turn on the fan. If the temperature is not high, it will not turn on. It's okay, as long as it doesn't affect your use of the computer. Of course, if the screen goes black in the future and affects your use of the computer, it may not be the cause. It may be that there is something wrong with your fan.

Unplug the memory, turn on the computer, if it keeps spinning, It's a memory problem. This is basically due to poor memory contact.

Remove all the hardware and plug it back in. It should be that some hardware is not plugged in properly

Open the case and clean the dust. If it doesn’t work, replace the fan

Dust is the biggest problem

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