After the computer is powered off, the screen restarts and there is no signal

After confirming that all the cables are plugged in correctly, if there is still no signal, it may be broken, find someone to fix it.

Is there an alarm? Maybe the graphics card is broken, or the monitor is broken.

First of all, you consider the power supply, generally this problem is caused by the power supply, if the problem is still there, consider the system and the motherboard, there are no other problems, it is estimated that the power supply is the reason.

Problem Analysis:

There are two situations when the computer boots up the display without signal: the display is not powered on (the power indicator is not on) or the display is powered on (the power indicator is on) but there is no signal or the screen shows "no sighal", the former means that the circuit is not connected, or the power interface or power cable is in poor contact or damaged, and the latter is generally a poor contact due to loose or oxidized memory modules, or poor contact with the display data cable, or damage to the memory, graphics card, display or data cable.

Handling suggestions:1If 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 can't do it, then it's simpler:

Palm or kick the chassis once or twice (pay attention to the location: the front of the shell on the left and right sides of the chassis that does not have an interface at 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.

2.If the above operations do not work, turn off the power and turn on the chassis, reinsert the graphics card, and plug in the data cable between the monitor and the graphics card. If it still doesn't work, consider that the cable or graphics card is damaged, then replace it with a new one.

3.If the monitor is not powered on (the indicator light is not on), check whether the power switch is turned on, then check the back of the monitor, plug the power cord connected to the monitor upwards (the power cord can be replaced if possible), and check whether the other end of the power cord is powered on to the outlet.

4.If the display can be displayed when connected to another monitor or the display of this machine is connected to another normal host and still cannot be displayed, it means that the monitor is damaged and needs professional repair.

What happens when the computer has no signal?

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

Check whether the signal cables of the monitor and the main unit are loose.

If reinserting the graphics card doesn't work, it's probably a problem with the graphics card.

Judging by your description, it can be displayed normally after a long period of time, and it should be no problem to say that the obvious card is obvious. This is still a problem with the monitor itself, it may be that the display is damp, you take a hair dryer to try to see if it will improve.

If there is a problem with the computer hardware, go to the computer repair shop to find a professional master to help you check the computer, see which hardware is broken or the software installation is faulty, and replace the hardware.

In the process of using the computer, the display has no signal after booting, and the screen displays "no signal" or "no signal". How to solve it? Next, I will introduce you to the solution to the problem that the display has no signal after the computer is turned on.

Solution to no signal failure of the display after powering on:

1. The characteristics of the data cable are poor, or the contact with the graphics card and 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.

2. Check whether there is any excess metal in the chassis, or a short circuit caused by the deformation of the motherboard, smell whether there is a burning paste in the chassis, whether there are burned chips on the motherboard, and whether the capacitors around the CPU are damaged.

3. Dust is the first killer of computer failure, if the dust in the chassis is excessive, the memory, graphics card and slot are in poor contact, and the hardware is corroded. Therefore, it is necessary to clean the computer regularly. Clean the dust off the motherboard, wipe the gold finger with an eraser, and check if the computer is normal.

4. Motherboard. The power dissipation of the on-board power circuit decreases, which makes the power supply of the graphics card insufficient, and the filter capacitor in the on-board power circuit is seriously leakage, resulting in the voltage of the corresponding power supply circuit decreasing, and also causing the occurrence of no signal failure of the display after the computer is turned on.

Unplug the reset cable on the motherboard and connect it with other switches and indicator lights, and then use a screwdriver to short-circuit the switch to see if it can turn on normally.

5. If you can't turn on the computer, use the minimum system method, unplug the data cable of the hard disk, floppy drive, and optical drive, and check whether the computer can be turned on.

Then connect the above devices to the computer one by one, when connected to a certain device, the display after booting no signal fault reproduces, indicating that the fault is caused by this equipment, focus on checking this equipment.

6. Check the memory, graphics card, CPU, and motherboard.

Use the plug-in method, swap method and other methods to check whether the memory, graphics card, CPU and other devices are normal, and replace the damaged devices if the devices are damaged.

1. There is the word "no signal" on the screen, indicating that the fault is not in the display, but:

1. Graphics card. Generally, the main control chip of the graphics card has poor characteristics, or the contact with the graphics card slot is not close, or there is too much dust in the graphics card slot;

2. Motherboard. Generally, the power dissipation of the on-board power circuit decreases, which makes the power supply of the graphics card insufficient, and the filter capacitor in the on-board power circuit seriously leaks, resulting in the voltage of the corresponding power supply circuit.

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

This type of failure is characterized by the word "no signal" being displayed until the shutdown or restart;

2. If the word "no signal" disappears after only a few seconds, then it is likely that the memory module has poor characteristics, or the memory module is not plugged in properly, or there is too much dust in the memory slot;

It is estimated that the problem of the landlord's computer belongs to the first item, and it is recommended to start with the data line first.

Is there still a graphics card slot on the motherboard? Try plugging in a different slot.