What is the reason why the computer shows no signal after turning it on

Unplug the memory module, wipe it and try to change it.

It may be that some hardware dust has accumulated and caused poor contact, you can first open the chassis to check the motherboard interfaces, especially the memory and hard disk interfaces, and then try to use the eraser memory and graphics card, sound card, network card cheat. You can also check whether the fault light on the motherboard has a faulty display, and find out the problem according to the **.

Details are as follows.

1. Open the chassis and check the motherboard interfaces, especially the memory and hard disk interfaces, which may be due to the dust accumulation caused by the long-term non-use of these parts can not be used normally; Then disconnect all the connections of the motherboard (except the CPU), remove the dust, and check that the motherboard is not disconnected from the virtual connection, or the foreign matter is short-circuited, and the capacitor is deformed and leaking.

2. Use the eraser to erase the memory and graphics card, sound card, and network card gold finger, clean the motherboard slot, and plug in the memory and graphics card, sound card, network card, etc. tightly.

3. If you can hear the sound of the motherboard after booting, but there is no image on the monitor, check whether the connection between the monitor data cable and the graphics card is firmly inserted, and tighten the screws; Also check the monitor for problems.

4. If there is a faulty LED light on the motherboard, you can check whether there is a fault** display after turning on the power, and find the cause of the fault; Try to replace the motherboard battery on the motherboard again, connect the positive and negative stages of the battery, and then install it.

5. Check whether the computer can be turned on after all the connections inside and outside the chassis are normal; If you can't access the system after booting it, it is due to a system failure and you need to reinstall the system.

6. If it still can't be turned on normally, you can only take the computer to the computer repair shop for a professional to check it.

The solution to the display no signal failure after booting up: after the power on the display has no signal but there is an alarm sound, when the computer is booted up, the system BIOS starts to power on the self-test, and when it detects that there is an error in a device in the computer, it will send out a sound to report the error.

Therefore, there may be a failure of the display with no signal and alarm sound. If there is no signal and alarm sound failure on the display after the computer is turned on, you can check the faulty equipment according to the meaning of the BIOS alarm sound to eliminate the fault.

The data cable characteristics are poor, or the contact with the graphics card or display is not close.

Check whether the external wiring of the computer is properly connected, and poor wiring contact will also cause no signal failure of the display after booting. Plug and unplug the VGA cable, power cable, data cable, and other cables again to check whether there is a connection problem.

There is also a special case, that is, the display VGA cable is connected to the wrong position, and the machine with the discrete graphics card must connect the VGA cable to the interface of the discrete graphics card.

Listen to me, I'm a professional computer repairer.

Exclusion: 1 Unplug the memory, wipe it off with toilet paper, and after installing it, the problem is solved.

2 Unplug the graphics card, reinstall it, and solve the problem.

Seeing that your computer can still turn on, it should be the above fault, but a failure can also cause no signal to boot.

3 The keyboard and mouse cable are plugged in backwards, or not plugged in.

4 There is clutter in the optical drive, see if it can be opened, redo the system to see.

5 There is a problem with the motherboard circuit, look at it separately.

6 The power supply of the host is aging, and the motherboard does not supply power, try changing the power supply.

7 Finally, there may be a problem with the monitor, change the computer to rule it out.

8. Pay attention to moisture and dust when using the computer.

I hope it will help you, hand hit, accumulation, please give points!!

Check whether the cable connected to the display is connected, if not, take off the memory, wipe it off, or try it with another memory

There is no signal on the computer boot monitor, teach you 5 solutions.

One is that the network is not good, and the other is that the plug at home is not plugged in well, please check it.

If there is a problem with the main chassis, go fix the following.