When the computer is plugged in, the CPU fan does not move after 2 seconds, and the computer cannot

The motherboard is probably burned out!!

You have to borrow a power supply to try it out to determine if it's a broken power supply (or just a socket issue) or a broken motherboard (or just a socket issue). You'll have to do your own research.

Changing the power supply, the problem of the power supply.

There are two possibilities:

1. The room temperature is too low, if the room temperature is lower than 5 degrees Celsius, you can try to increase it, and after the room temperature is higher than 5 degrees Celsius, you can see if you can start the computer smoothly, but this possibility is not very large;

Second, I think that the most likely reason is the power supply, specifically the PG (power good, power good) signal of the power supply. To put it simply, when the power is turned on, the PG signal is generally delayed for a second before being sent, and after the CPU is received, it will send a boot command, and the hard disk and graphics card will act according to the instructions.

To solve this problem, in addition to replacing the power supply, there is also an economical, practical, safe and reliable way, that is, hands-on repair, the specific method is:

Open the power supply shell, find the PG signal output (generally connected to the gray wire, but also connected to the white one), and then connect a 33, 50, or 100 (UF 16V) electrolytic capacitor in parallel between the PG output and the ground, be sure to pay attention to its polarity, do not connect it in reverse. The charging characteristics of the capacitor are used to artificially "create" a delay of about one second, that is, to output an analog PG signal, and the computer can work stably.

I have a success rate of about 70% in practice, and this will not cause any impact or harm to the whole machine.

If you succeed, please let me know so that I can continue to work hard.

When the computer is plugged in, the CPU power supply and fan start running, which may be due to the following reasons:

1.Power supply problems: There may be power supply problems, causing the system to fail to boot properly after the computer is turned on.

2.Hardware problems: There is a fault in the motherboard and other hardware components of the computer, which causes the computer to fail to open the car and machine normally, and also causes the fan to run.

3.BIOS settings: The computer is not properly set to the BIOS, which causes the computer to not boot properly, and the fan is running to protect the CPU from not being damaged by heating.

Workaround:1Check whether the power supply is normally closed, and confirm whether the source connection of the ruler is stable.

2.Check if the hardware components of your computer are normal, such as if the CPU is broken or if there is a problem with the graphics card.

3.Check whether the BIOS settings are correct, enter the BIOS, and check whether the boot boot items and other settings are correct. If you can't do it, it is recommended to find a professional or after-sales service center to find a solution.

Check if the BIOS has set AC Recovery in the power settings to ON.

This situation could be a problem with your computer's power system that needs some troubleshooting and fixing. You can check whether the power cord is plugged in tightly, whether the power plug is loose, and whether the power switch is off. If there are no problems with the above, you can consider checking whether the power supply ** unit is normal and whether the power supply is damaged.

At the same time, you can check whether the CPU cooler and fan are clean, if there is dust accumulation, the fan may run abnormally. If the problem is still not solved after the above steps, it is recommended to contact a professional computer repair personnel for troubleshooting and do not disassemble the stupid circle at will, so as to avoid other problems.

The computer is turned on, and the power fan turns and does not respond, which may be due to the following reasons.

1. First of all, it can be a switch problem, such as a bad contact. We turn off the switch on the back of the computer, or simply unplug it. etc. will be reinserted.

2. If it doesn't work, it may be that the computer has static electricity, causing adverse reactions. We can find a piece of metal wire to help with the computer screws, and the other end to connect the metal at home that is in contact with the ground. It is better to buy steel wire to be beautiful.

3. It is also possible that the memory module is in poor contact, which is quite possible. Remove it and wipe it clean with an eraser. Then plug it back in, to be steady. Dual memory note compatible.

4. Computer fan problems. Fan problems will cause the system to determine that there is no fan, and in order to protect the computer motherboard, the computer will be forcibly stopped. Solution: Check whether the fan is in good contact. Reinstall. It's best to add some heat sink.

5. Graphics card problems. It's also quite possible. Most of them are poor contact. Simply remove it and reinstall it. The screws should be tightened. The installation should be stable and slow.

6. Motherboard problems, if it's okay. That could be the motherboard. If this is the problem, then you can only go to the repair shop to check if there are any problems such as bad sectors.

The main performance of the fan is reflected in the following aspects: speed, fan blade shape, fan blade, and CPU fan.

1. Angle and bearing system. In general, the speed of the fan is indicated on the manual of the radiator. Generally speaking, 30% of the heat dissipation effect of a radiator depends on the speed of the fan.

But the higher the fan, the better. The correct fan speed should be determined according to the heat generated by the CPU, and the fan speed selection of different specifications should be differentiated.

The basic principle is: under the premise of generating the same air volume, the larger the fan, the lower the speed, and the noise will also be smaller, generally between 3500 rpm and 5200 rpm is more conventional.

2. The greater the power, the stronger the fan wind, and the better the heat dissipation effect. The power of the fan is directly related to the speed of the fan, that is to say, the higher the speed of the fan, the more powerful the fan. At present, the best fans in the general computer market are DC 12V, and the power varies from W to W, so the power needs to be selected according to the heat generated by your CPU.

3. A better radiator, there will be no burrs on the edge, no deformation of the heat dissipation fins, smooth bottom without cracks, neat appearance, generous shape, quality assurance, anti-counterfeiting marks or other characteristic trademarks, etc. In addition, when choosing a radiator, you should also pay attention to the bottom of the radiator should not be too thick, because the thermal conductivity of aluminum is not very good, and too thick will affect the transfer of heat;

In addition, the deflector groove on the surface of the radiator should be denser, which can ensure that the radiator can have a large contact area with the air, so as to enhance the heat dissipation effect. Generally, computer enthusiasts will give the CPU ** water cooling fan when the economy allows, and achieve the effect of rapid cooling through the circulation of liquid.

The computer is not responding when it is turned on, the power supply fan does not move, and the CPU fan does not move, reason:

1. Since the power supply fan does not rotate, it means that the host has not started at all, and there may be no power on or the power cord is not in good contact.

2. The power supply may be damaged, you can test whether the power supply is normal first.

3. The motherboard and other components may automatically protect the power supply due to short circuit, and just exclude other short-circuit hardware.

It may be a malfunction caused by poor hardware contact.

1. Turn off the power, open the case, clean up the dust, especially the dust of the CPU fan, and check whether the CPU fan is rotating normally.

2. Plug and unplug the memory, wipe the gold finger part with an eraser, and re-insert it (don't reverse it).

3. Plug and unplug the graphics card, wipe the gold finger part with an eraser, and reinsert it tightly (the buckle should be buckled).

4. Unplug the power cord, cut off the motherboard button battery, wait for three minutes, and then reinstall the motherboard.

5. If the above operations cannot solve the problem, it is recommended to send it to the maintenance center.

If it is not a problem that the connectors are in contact, you can unplug the power supply of the hard disk and optical drive, and start the machine to see if the screen is hazy. If it still doesn't work, you can take off the battery (clear coms) on the motherboard, press it again after a few minutes, and start to see if it can start. No more, you can only find a store to replace the motherboard or graphics card.

It may be that the power of the power supply is too low to bring up. Unplug the power cord of the hard disk and optical drive, and try to turn it on again, if it can be turned on, it means that the computer is not broken, just change the power supply.

If it still can't be turned on, use the replacement method (that is, try another accessory) to check the memory, CPU, motherboard, and graphics card one by one.

Find the defective accessory and replace it.

Green and black is just forced to boot, this means that the power supply is good, this means that your motherboard may be broken, and you have to go to the motherboard to warrant it.

Reinsert the memory graphics card, and pick the motherboard battery Try it again.

There is basically no PC speaker installed on the motherboard now, and there is no alarm sound, so I can't accurately know where the problem is.

In this case, it is a problem with the three major parts of the computer (CPU, memory module, graphics card) or motherboard, only if these four things have a problem, the power will be turned on but the display will not be lit, it is recommended that you replace the parts one by one with the replacement method.

Personally, I think that the possibility of memory problems is relatively high, you can use an eraser to wipe the gold finger of the memory module, and try again after removing the oxide.

On the supplementary question:

Hello, you said Jixian, the question is won't Jixian be bad? OK even if the set is not broken, I didn't say that there are three other objects, you can only use the elimination method for such a problem, I don't think anyone can say your problem to the point.

Finally, I hope you can solve the problem through elimination, and you can use the computer when the Chinese New Year is approaching.

I've had a similar issue! It may be that there is a problem with the graphics card, you take off the graphics card, clean the graphics card slot and gold finger, and try again!!

The problem of the CPU fan, or replace the fan as soon as possible, you may have skipped the temperature self-test of the CPU if you try to turn on the computer a few more times, so that the CPU has been working at high temperatures when you turn it on, and it is easy to break, and you will have to change the CPU when the time comes.

Most of this is caused by problems with the motherboard. As long as the CPU is not broken, the CPU fan will turn. But the chances of the CPU being bad are low. So you can see if there is a problem with the motherboard first.

It should be the reason why the motherboard is deformed or dusty, and if you want to completely solve it, you need to replace the motherboard. Is it a Baga motherboard?

You haven't cleared the fan in a long time, right? One of them is that there is too much dust inside, and the temperature is too low now. It is recommended to take it apart and clean it up, and replace it if it really doesn't work.

There is a problem with the power supply line of the motherboard, it may be that the motherboard is burned, you try to plug and unplug the power socket of the motherboard, most of the time you need to change the motherboard.

Unplug the memory module! Clean up the cheat and take a look!

This may be caused by insufficient power supply from the power supply voltage.

The specific insights are as follows:

The first possibility is that the voltage supply is insufficient. It may be a power supply problem, please check if the power outlet is normal and the power cord is normal. It may also be a problem with the power supply of the case, please check whether there is a 5 volt standby voltage, whether the connection between the motherboard and the power supply is loose, if you can't measure the voltage, you can find a power supply to change it.

Motherboard issues can also cause this, and if both of the above are not problematic, then there is a greater chance of motherboard failure. First of all, check whether the connection between the motherboard and the boot button is loose and whether the switch is normal. You can try shorting the switch with a wire.

If not, you can only try replacing a motherboard. (Note: Try to find a board with the same model or chipset, as other motherboards may not support your CPU and memory).

Press the power button, the fan rotates, but the monitor has no image, and the computer cannot enter the normal working state. In this case, it may be that the fan is turning to indicate that the power supply has started to power supply, the monitor has no image, the computer cannot enter the normal working state, the computer has not passed the system self-test, the motherboard BIOS settings have not been output to the monitor, and the fault should be on the motherboard, graphics card and memory. But sometimes a poor quality power supply and a damaged display can also cause this failure.

There are many reasons for this situation, and it is recommended that it is best to find a professional computer maintenance personnel to troubleshoot, so as to avoid secondary damage to the computer caused by their own operation errors, which will bring you economic losses.

This is a protection shutdown caused by a short circuit fault in the power supply part of the motherboard. If the CPU power supply part of the component is damaged, it can be repaired for only a few tens of yuan (the cost of spare parts is only a few dollars). If the north and south bridges are damaged, then at least you will be charged more than 100.

You can take a closer look at the motherboard to see if there are any abnormal shapes of components such as capacitors, MOS tubes, etc.

Causes and solutions:

1. The memory module is loose or damaged.

Solution: Use an eraser to wipe the gold finger of the memory module and reinsert the memory stick; Replace the memory module.

2. Poor contact of the graphics card.

Solution: Same as memory method.

3. The main engine is short-circuited.

Workaround: Clean up the host and replug the wiring.

4. Motherboard BIOS problems.

The motherboard BIOS stores important hardware data, and if it fails, it can cause the computer to not boot.

Solution: Go to the motherboard BIOS settings page and restore the BIOS to the default value.