What should I do if the computer turns on the CPU and the power fan turns, but it doesn t light up?

Generally, this situation is a memory gold finger.

Caused by oxidation or poor contact. Encounter this situation:

1. Unplug the computer power cord first, and press the on/off button on the chassis 5-6 times. Releases the residual charge of the motherboard.

2. Then open the side panel of the chassis and plug and replace the slots of the memory.

3. Remove the CMOS battery from the motherboard and install it after 1 minute.

The computer has a discrete graphics card, so it's best to plug and unplug the graphics card. After the above operations are completed, the computer is powered back on.

The fault still needs to be booted using the minimum system method: (power supply + motherboard + CPU + memory + graphics card + monitor).

At this time, you should normally see the display content, pop up the hard disk, keyboard and other prompts that cannot be detected, you can enter the BIOS, buzzer.

There are no anomalous vocalizations. If it is abnormal, the monitor does not display (or the screen is blurred) or the buzzer has an abnormal sound.

1) Memory issues.

a.Problems per se. It doesn't work in any slot, and it doesn't work on other machines. Then the only way to do this is to change the memory. Buzzers generally have an unusual sound.

b.Compatibility issues. Other machines can be used, but this one can't; Or a single root can be used separately, but two roots cannot be used. Change memory.

2) Display graphics card issues.

a.Wiring issues. Check if there is any needle breakage or short circuit.

b.The graphics card itself is damaged.

c.The monitor is damaged (very unlikely).

b.Motherboard issues. The graphics card slot part, or the related control circuit is faulty. At this time, it can only be solved by changing the motherboard.

The case of this monitor being bad is very, very small.

Don't know if your motherboard is connected to the speakers? Generally, there is a connection, if you connect, unplug the memory (do not plug in) and turn it on, if it will alarm, it means that the CPU and the motherboard are working, and there is a problem if you don't call it.

In addition, the main judgment is whether it is normal, don't look at the monitor, look at the keypad light on the keyboard, press a few more times, if it is not on or always on (when pressing), it has absolutely nothing to do with the display.

Generally, this situation is caused by oxidation or poor contact of the gold finger in the memory. Encounter this situation:

1. Unplug the computer power cord first, and press the on/off button on the chassis 5-6 times. Releases the residual charge of the motherboard.

2. Then open the side panel of the chassis and plug and replace the slots of the memory.

3. Remove the CMOS battery from the motherboard and install it after 1 minute.

4. The computer has an independent graphics card, and it is best to plug and unplug the graphics card. After the above operations are completed, the computer is powered back on.

The power light of the computer host is not on, the fan is rotating, the motherboard light is not on, and the fan is rotating.

Analysis: The fan rotation indicates that the power has been turned on, and the most likely is that the memory is in poor contact. Processing:

If the monitor is powered on but no signal is displayed, turn off (if the short press of the power switch is invalid, press and hold the switch until the power indicator goes out or directly unplug the power cord) Power off the case, replug and unplug the memory module, and wipe the gold finger with an eraser in one direction (the back of the thumb fingernail is also fine), if possible, it can also be installed in different memory slots, and then turned on after installation (before operation, you should also touch the wall with both hands to release your static electricity or wear anti-static gloves). If you don't know how to do it, it's simple: slap or kick the chassis once or twice (note the location:

The front of the shell on the left and right sides of the chassis without an interface in the back; Attention said: Don't push too hard, of course, don't be weak). The above may need to be repeated, and if it doesn't work, you need to replace the memory module.

If you have more than two memory modules, you need to test them one by one.

Generally, this situation is caused by oxidation or poor contact of the gold finger in the memory. Encounter this situation:

1. Unplug the computer power cord first, and press the on/off button on the chassis 5-6 times. Releases the residual charge of the motherboard.

2. Then open the side panel of the chassis and plug and replace the slots of the memory.

3. Remove the CMOS battery from the motherboard and install it after 1 minute. The computer has a discrete graphics card, so it's best to plug and unplug the graphics card. After the above operations are completed, the computer is powered back on.

**Processor.

**CPU (English: Central Processing Unit Processor) is one of the main equipment of electronic computers, and the core accessories in computers. Its function is mainly to interpret computer instructions and process data in computer software.

The CPU is responsible for reading the instructions, decoding the instructions, and executing the core components of the instructions.