The power supply is normal, but the motherboard is not receiving power and the power supply fan is not spinning. What is going on?

php editor Xigua pointed out that when the power supply is normal but the motherboard does not receive power and the power fan does not spin, it may be caused by a power line failure, a motherboard failure, a loose power interface, etc. Solutions include checking the power line, replacing the motherboard, replugging the power interface, etc. If the problem is still not resolved, it is recommended to seek professional maintenance help to ensure the normal operation of the device.

The power supply is normal, but the motherboard is not powered and the power supply fan is not spinning. What is going on?

The power supply is normal, but the motherboard is not powered on. The faulty part is usually the motherboard.

1. To determine whether it is a power problem, first unplug all the cables connected to the motherboard.

Find a paper clip.

Find a set of 24-pin (some are 20-pin) cables on the power supply, and find the green wire and the black wire. There is only one green wire and there are several black wires. Choose one close to the green wire. Just use any of the black ones!

Insert one end of the U-shaped paper clip into the green hole, and the other end into any black wire hole next to the green wire.

After inserting the paper clip, you can now connect the power cord and start powering on.

If the fan of the power supply is spinning at this time, it is basically possible to determine that there is no problem with the power supply.

If the fan of the power supply does not rotate, you can basically judge that there is a problem with the power supply and you need to replace the power supply and test it.

2. After detecting that the power supply is normal, use the power supply and the motherboard to turn on the computer separately. Use a screwdriver to short-circuit the power SW pin on the motherboard.

At this time, the motherboard is powered on and the power supply fan will rotate. Then, Add memory, graphics card, hard disk, and connecting cables at one time until the fault recurs and you can find out the faulty part that caused the motherboard to not power on. If the motherboard still does not power on, then the faulty part is the mainboard.

How to solve the problem when the fan socket of the computer power circuit board is out of power?

You obviously don’t have power supply, check the reason first, plug in the power supply first

Use tweezers to connect it, short-circuit it and see if the power fan rotates

Check If you turn the green one and one of the three black ones

, it proves that there is no problem with the power supply. Then plug in all the sockets and connect the motherboard power jumper with tweezers to see if it can start. If it can, it means that the hardware is basically faulty. The problem may be that the chassis button circuit is blocked.

If it does not transfer, it should be a motherboard problem or other circuit problem, which requires further inspection. At this time, you need to gradually replace other accessories and troubleshoot the problem.

Does the CPU fan stop after turning on the motherboard?

1. If you encounter the problem that the fan stops after spinning, you should check the memory module. The detection method is: unplug one root to test the boot status. If it can boot but won't restart, then it's a memory problem. If not, it's not a memory problem.

2. If there is no problem with the memory test, but the CPU fan still cannot be turned on or the CPU fan still stops and turns off, check whether the host power supply is good. The detection method is the replacement method. Use another new power supply to test. If it can be turned on, , if it restarts automatically, it is basically a power supply problem, no need to doubt it.

3. If it still cannot be solved, consider checking the motherboard problem. It may be that the motherboard has protection enabled.

4. If it can be turned on and then automatically restarts, it is likely to be a system problem. However, this problem is relatively rare and usually occurs on old computers. You can try reinstalling the system to see if it can work. solve.

The motherboard is powered on but does not light up, the fan does not spin and there is no movement. What is the problem?

The power supply is normal, but the motherboard is not powered on. The faulty part is usually the motherboard.

1. To determine whether it is a power problem, first unplug all the cables connected to the motherboard. Find a paper clip. Find a set of 24-pin (some are 20-pin) cables on the power supply, and find the green wire and the black wire. There is only one green wire and there are several black wires. Choose the black ones next to the green wire. Any one will do! Insert one end of the U-shaped paper clip into the green hole, and the other end into any black line hole next to the green line. After inserting the paper clip, you can now connect the power cord and start powering on. If the fan of the power supply is spinning at this time, it is basically possible to determine that there is no problem with the power supply. If the fan of the power supply does not rotate, it can basically be determined that there is a problem with the power supply, and the power supply needs to be replaced and tested.

2. After detecting that the power supply is normal, use the power supply and the motherboard to turn on the computer separately. Use a screwdriver to short-circuit the power SW pin on the motherboard. At this time, the motherboard is powered on and the power supply fan will rotate. Then add memory and graphics card at one time. , hard disk, connecting cable, until the fault recurs, you can find out the faulty part that caused the motherboard to not power on. If the motherboard still does not power on, then the faulty part is the mainboard.

The graphics card fan does not spin when the motherboard is powered on?

It may be caused by poor contact between the graphics card and the PCI-E slot of the motherboard. If there is no response at startup, check whether the graphics card is properly powered. If the graphics card is not powered properly or the power supply is insufficient, the graphics card cannot operate normally. Use the integrated graphics alone to see if it can be turned on normally. Uninstall the graphics card, clean the dust, and then install it to see if it can be used normally, or use a replacement. If you try to use the graphics card on other motherboards, the problem will be the same and troubleshoot the hardware problem.

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