The main engine has not lit up, and the motherboard has not lit up, what is the reason? Please guide

There are many reasons why the machine does not light up, Tan If you have replaced the motherboard, then the biggest possibility is that there is a problem with the power supply, you can check whether there is a power-on indicator on the motherboard, if there is, check whether it is not lit, it means that the motherboard is not powered on, you can determine that it is a power supply problem, you can replace the power supply to try, if it is on, it means that the motherboard is powered on, check whether the CPU fan is turning, if it turns, it may be that the power supply voltage is insufficient.

Aside from the power supply problem, is there an alarm sound after turning on, if there is a short alarm sound, it may be a memory problem, replace the memory and try it.

You'll need to wire the front panel power indicator to see if it's connected to the motherboard.

Or didn't pick it up.

Check if there is a problem with the power supply and power switch.

There must be a problem with the power cord, or the plug holder that connects the plug.

The main switch is broken, you open the machine cover, use the key to see if it can be lit, it is the head of the line that says power.

There are many reasons why it doesn't light up. If any part does not fail, it will not light up. The key is the symptoms of failure.

If you don't know. Then the power supply and CPU may be broken. If the memory is broken or incompatible with your current motherboard, there will be an alarm in most cases.

That's all I can offer. If you get the console in my hands, I'll know right away what's wrong. Years of experience can only be understood, not spoken.

Jumper right.

The power supply is broken. The power cord is broken.

Power supply! Either that's a wiring problem on the front panel. You check it out.

If your previous computer is working normally, but it can't be lit after replacing the power supply, this kind of problem occurs, generally either the power supply you replace is bad, and another is when you replace the power supply and plug in the motherboard, it may not be in contact with the relevant parts of the motherboard, and pay attention to your new power supply, if the graphics card on the original motherboard needs to be powered externally, The new power supply must be supported, and then pay attention to the external power supply next to the CPU, don't forget to plug it in.

Check whether the connectors are all connected correctly, if it still doesn't work, you can only find another power supply to replace it.

Didn't connect it or connected it incorrectly, such as the wrong boot cable.

It is recommended to go to a computer repair shop to find a professional person to check for you, it is generally caused by mismatch, and you can repair and replace the hardware configuration.

It is recommended to go to a computer repair shop to find a professional person to check for you, and repair and upgrade the system hardware configuration.

It may be that the case is charged can release the CMOS battery, and power off for a while and then restart me on it.

This can be a failure of the power supply, and the general power failure occurs in an average of 80%.

Check the treatment:

The failure of the power supply system can be caused by the open circuit of the AC power supply line, the abnormal AC power supply voltage, the failure of the microcomputer power supply or the short circuit phenomenon in the host. When the AC power supply voltage is abnormal (overvoltage or undervoltage), the host power supply is no-load and there is a short circuit in the machine, the protection circuit inside the host power supply is activated, and the output of the power supply is automatically cut off to protect the equipment in the host.

1. When the power supply system fails, first check whether the AC power supply is connected to the host.

2. After confirming that the AC power supply is connected to the host, turn on the power supply close to the ear, turn on the power switch for a short time and pay attention to listening. The reason is that the AC power supply is abnormal or there is a short circuit in the machine, which causes the protection circuit inside the power supply to start. Please check the processing as follows:

If the AC voltage exceeds 240V or is lower than 150V, the overvoltage and undervoltage protection circuit in the host power supply will start and stop supplying power to the equipment in the machine, please use a stabilized power supply or UPS power supply to supply power to the host.

If the AC power supply voltage is normal, unplug the interface card and other equipment power cords and signal lines in the host one by one, and then power on the test machine, if the host power supply is restored when a certain equipment is unplugged, it is the equipment that has just been unplugged is damaged or improperly installed resulting in a short circuit, so that the short circuit protection circuit in the power supply starts and stops supplying power to the equipment in the machine.

If the power supply is still in the state of no output after unplugging the power cords of all devices, it means that the power supply is faulty and please repair the power supply.

Note: At least one load (such as optical drive or hard disk) should be connected when overhauling the power supply, if the no-load is connected to the microcomputer power supply, the no-load protection circuit of the microcomputer power supply will start and stop the output.

3. If the power supply of the host is not working, please check whether the power switch of the host installed on the front panel of the chassis in the host is normal, if the power switch is intact, it is generally a power failure.