Doesn't the power supply light up when assembling a computer? After reassembling the computer, it won't turn on. The power is still on. The fan isn't spinning either?

The power does not turn on when assembling the computer? The computer won't turn on after reinstallation, but the power is still on but the fan is not moving at all? These common computer failures cause headaches to many people. The editor of PHP Apple conducted a detailed analysis and troubleshooting of these problems, and summarized the common reasons and solutions that cause the power to not light up and cannot be turned on. If you are struggling with these problems, please continue reading below to get ideas and methods for solving the problems.

Assembling the computer power supply is not on?

It may be a power problem! It's very simple. Unplug everything that's plugged into the motherboard from the power supply. Then use a paper clip on the 20 4-pin end to connect the green wire to any black wire. If the power supply fan is spinning, then The power supply is good and can be ruled out.

After confirming that the power supply is good, connect the motherboard power supply and CPU power supply. If the independent graphics needs power supply, also connect it. However, if there is integrated graphics or nuclear graphics, it is recommended to unplug the independent graphics first (click When it lights up, it shows independently on top). Then unplug the hard drive indicator light, power indicator light, and restart button (leave only the power-on cable), and then turn on the computer. If it cannot be turned on, it means that the connection between the indicator lights, the reset button, and the power-on button is wrong. !

The computer cannot be turned on after reassembly. The power is still on. The fan isn't spinning either?

wrote: Please check the CPU-related circuits or the host power supply.

So, 1: Check whether the motherboard power supply is plugged in.

2: Check whether the CPU auxiliary power supply is plugged in.

Then, it’s best to take a picture of your installation so we can see if there is any problem with your wiring.

Finally, you can first describe why the computer cannot be turned on. For example: the CPU fan spins a few times, then stops spinning; it still never spins.

For example, the monitor will light up for a while, but still not light up all the time.

For example, does the motherboard have Didi and Didi alarm sounds?

You only have a picture of the test card, which contains too little information.

The computer power box fan is not spinning?

Let me explain. When the computer is connected to the power supply, the fan will not spin. Even if you turn on the switch on the back of the power supply, it will not spin because the power supply does not receive a power-on signal. It is very simple to check whether the power supply is normal. In the 24PIN interface of the power supply, use an iron wire to short the green wire pin and any black wire pin, and the fan of the power supply will rotate. The fan of many power supplies stops quickly after spinning because it detects that there is no load. When you connect the power supply to the motherboard and press the power button, the motherboard will send a POWER ON electrical signal to the power supply. At this time, the power supply starts to work and the fan starts to spin. The reason is the same as above when you short-circuit the green wire and the black wire. The same line. There are also some high-end power supplies that have a strategy of stopping the fans at low loads, because those power supplies have very high conversion efficiency, generate very little heat at low loads, and do not need fans for heat dissipation. If the fans are stopped, there will be no noise. I remember that the Cooler GX650 does not have this setting. The fan should start spinning after it is turned on. If it does not turn on, then there is a problem with the power supply.

The fan does not spin when the computer power is turned on?

Another possibility is that there is too much dust inside the computer mainframe, causing the power supply fan to not run smoothly. At this time, we only need to use a pump or hair dryer to clean the dust inside the computer mainframe. Just clean it.

1. If the fan does not spin when the laptop is turned on, you need to confirm whether the fan is broken, then check whether there is too much dust accumulated in the fan, then confirm whether there are signs of rust in the fan shaft, and finally eliminate the above factors. Then send the computer to a professional repair shop.

2. Chassis fan and cpu fan. The case fan is installed on the computer case to dissipate heat for the entire internal space of the computer case, while the CPU fan is mainly installed on the CPU processor to dissipate heat from the CPU. Generally speaking, 30% of the cooling effect of the radiator depends on the speed of the fan. But the higher the fan speed, the better. The correct fan speed should be determined based on the heat generated by the CPU. The selection of fan speeds of different specifications should be differentiated. This is a basic principle.

3. What should you pay attention to when buying a computer power supply? Power supplies have certain redundancy. For example, a power supply with a rated power of 300W can still work stably and normally at 310W, but try not to use it beyond the rated power. , otherwise the power supply or other computer components may be burned due to overcurrent. In the nameplate label of zero power supply products in the city, Cai Technology’s power supply does not indicate its power parameters on the label nameplate.

The fan of the computer power supply does not turn on, even if it is replaced with a new power supply, what is going on?

Analysis: The computer has been idle for a long time, resulting in poor hardware contact. If the host indicator light is on or off, and the screen is powered on but has no signal or displays "nosighal", it is usually due to poor contact of the memory module or damage to the graphics card. Suggestions:

1. If the monitor is powered on but shows no signal, shut it down (if short pressing the power switch is ineffective, press and hold the switch until the power indicator light goes out or unplug the power cord directly). Turn off the power, open the case, and plug it in again. Pull out the memory stick, wipe the golden finger with an eraser in one direction (you can also scrape the back of your thumbnail), install it and then turn on the computer.

2. If the above operation is ineffective, turn off the power, open the case, re-insert and unplug the graphics card, and tighten the data cable between the monitor and the graphics card. If it still doesn't work, consider the graphics card is damaged and replace it with a new one.

3. If the host can be displayed when connected to other monitors or the local monitor still cannot be displayed when connected to other normal hosts, it means that the monitor is damaged and needs repair.

Why does the fan not spin when the computer is not connected to the power supply?

Let me explain.

After the computer is connected to the power supply, the fan will not rotate. Even if you turn on the switch behind the power supply, it will not rotate because the power supply does not receive the power-on signal. It is very simple to check whether the power supply is normal. In the 24PIN interface of the power supply, use an iron wire to short the green wire pin and any black wire pin, and the fan of the power supply will rotate. The fan of many power supplies stops quickly after spinning because it detects that there is no load.

When you connect the power supply to the motherboard and press the power button, the motherboard will send a POWER ON electrical signal to the power supply. At this time, the power supply starts to work and the fan starts to spin. The principle is the same as what you have mentioned above. Short the green wire the same as the black wire.

There are also some high-end power supplies that have a strategy of stopping the fan at low loads, because those power supplies have high conversion efficiency, low heat at low loads, and do not need fans for heat dissipation. If the fans are stopped, there will be no noise. I remember that the Cooler GX650 does not have this setting. The fan should start spinning after it is turned on. If it does not turn on, then there is a problem with the power supply.

The fan of the newly purchased computer power supply is not spinning?

If it is good, it will not turn on after power is turned on. Generally, there are pinout definition instructions on the power supply. You can connect the pg.on wire to the black wire and then turn on the power. At this time, the power supply has output. pg.onThe root is green first. If you are not sure, it is best to find someone who knows how to do it for you. Wouldn't it be dangerous? Electricity is invisible and intangible, safety first

The computer power supply is out of power and the fan won’t spin?

Confirm whether the fan is broken. If it is broken, you can take it to a maintenance center to replace it or repair it.

If the fan is normal but does not rotate, there may be too much dust accumulated in the fan. When cleaning, you can use cotton swabs or paper to wipe off the dust. Since it may be charged with static electricity, remember not to use it during this process. Wipe with wet towel.

If you find that the fan shaft is rusty, disassemble the fan and apply some professional lubricating oil on it.

If the above inspection finds that there is no problem with the fan, it may be caused by the computer motherboard.

How long is the life of the assembled computer power supply?

If we talk about the life span after use, this is not necessarily true. It may break in one year, or it may not break in ten years. But if we talk about performance life, the longest is estimated to be 5 years. After 5 years, even the current mid-to-high-end configurations may even have web pages and QQ stuck by then

In fact, many computers are being operated The system was eliminated. The new operating system has high hardware requirements, and old computers are too slow to run the new operating system. Just be eliminated. This is the trend and law, and it is also the need of software and hardware manufacturers and dealers.

I just finished assembling the computer and the CPU fan doesn’t spin when I turn it on?

The reasons and solutions are as follows

The processor fan power cable has poor contact with the motherboard interface. This situation is relatively common, because desktop computers can easily accumulate some dust and cause poor contact. Therefore, the BIOS cannot detect the processor fan;

If some users are unlucky and buy unqualified processor fans, this situation will also occur. You can check, some unqualified motors only have two The power cord, and there is no speed measuring wire in the middle, naturally cannot feedback information to the BIOS;

The power cord of the processor fan is plugged in wrongly and is not plugged into the processor Fan (processor fan) interface of the motherboard. It will not affect the normal operation of the computer, but the BIOS cannot detect the processor fan.

How to solve the problem that the CPU fan of the assembled computer does not spin:

Problem phenomenon: a new configuration The assembly machine is normally used normally. It's just that in the motherboard BIOS, the processor fan speed is reported as 0 rpm (rev/min), but the fan is actually running well.

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