The computer boots up and the host is running normally, and the monitor shows no signal and then the

The reasons and solutions for the display of no signal after the desktop is turned on are as follows:

1) The first reason: it is possible that the connection between the desktop host and the monitor is not in good contact (especially the interface is not plugged in or loose), and there may be a problem with the data cable of this connection, so there will be no signal input to the screen, no display, black screen, solution: just re-plug the connected data cable, or replace the data cable.

2) The second reason: due to the formation of an oxide layer on the surface of the gold finger of the memory or independent graphics card, resulting in poor contact between the memory and the memory slot, the poor contact between the graphics card and the graphics card slot, resulting in a black screen and no signal output

Solution: You can turn off the power first, open the compartment, dial out the memory, use the eraser against the part of the gold finger (that is, where there is a copper sheet,) wipe it back and forth a few times, and then insert it back into the memory slot (or insert it back into the memory slot), it's OK, if there is an independent graphics card, you can also use the same method to deal with the graphics card, and then insert it back into the graphics card slot, and finally install the machine, restart the computer and it's OK, (take the memory ** as follows:)

3) The third reason: that is, the graphics card's video memory is soldered, the performance of the main chip is reduced, the graphics card BIOS is disordered, and the control power supply IC is problematic, which will cause the graphics card to fail to work normally, that is, the graphics card is broken, and naturally the computer will have no signal output, and it will not be able to display, and the screen will be black when it is turned on.

The computer is just a fan turning, the display does not respond, there must be a problem with the computer hardware, it is best to use the replacement method to eliminate the problem, judgment method:

1. Press the upper and lower case on the keyboard. The light is on, indicating that the graphics card, monitor, and other hardware are faulty.

2. If the keyboard light does not light up, it means that it is a memory, CPU, motherboard, or power supply problem.

Solution: 1. If the keyboard light does not light up, first wipe the memory module with an eraser, and check whether the gold finger of the memory module has any burnt marks. Replace the memory in the slot.

2. Check the capacitors and resistors on the motherboard to see if the capacitors are bulging, whether there is a burning smell on the motherboard, and clean up the dust on the motherboard.

3. Remove the CPU fan, power on and turn on, test whether the CPU has a temperature change by hand, if not, the CPU is not working, either the motherboard is broken, or the CPU is not plugged in properly, and the CPU is re-plugged.

4. Power supply problem, although the power supply is powered on, but the motherboard can not work normally, replace the power supply and try it.

5. If the display card is loose or oxidized, the keyboard light will be on, the screen will not be displayed, wipe the gold finger of the graphics card with an eraser, and check whether the capacitance on the graphics card is bulging.

6. Minimize the test method, only leave the power supply, motherboard, CPU, memory, graphics card, keyboard, monitor, unplug all the wires on the rest of the motherboard, use a screw knife to short the switch pins, if normal, add the rest of the hardware, piece by piece, until the cause of the problem is found.

Me: The specific solution to the black screen of the display screen without signal is as follows:

1.If there is a problem with the monitor, first power on the computer monitor separately to see if the light of the monitor can be lit normally, and if the monitor is damaged, please replace it in time.

2.If there is a problem with the connection cable, check whether there is a problem with the connection cable between the computer and the monitor, and see if there are problems such as loose materials or poor contact. You can replug the cable or replace it to see if that solves the problem.

3.If the memory module does not touch or is damaged, the computer monitor will not be displayed, you can unplug the memory module, wipe the gold finger and then reinsert it to try to solve the problem.

The computer monitor has a black screen and no signal, and the host is running normally.

The computer monitor has a black screen and no signal, and the host is running normallySolution: 1. Graphics card: Generally, the main control chip of the graphics card is not in good shape, or the contact with the graphics card guessing slot is not tight, 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 is seriously leakage, resulting in the voltage reduction 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.

Summary. This phenomenon can be caused by a malfunctioning computer monitor, a malfunction of the internal components of the monitor, or a problem with the connection between the monitor and the computer. First of all, you should check whether the power supply of the computer monitor is normal, check whether the power cord of the monitor is connected, and if the power cord is not in good contact, you can replace the power cord.

Secondly, check whether the interface of the monitor is connected, you can try to unplug the connector, and then plug it back in to see if that solves the problem. Finally, you can replace the monitor and see if that solves the problem.

The computer monitor has a black screen and no signal, and the host is running normally.

This phenomenon may be caused by a malfunction of the computer monitor, a malfunction of the internal trace component of the monitor, or a problem with the connection between the monitor and the computer. First of all, you should carefully check whether the power supply of the computer monitor is normal, check whether the power cord of the monitor is connected, and if the power cord is not in good contact, you can replace the power cord. Secondly, check whether the interface of the monitor is connected, you can try to unplug the connector, and then plug it back in to see if that solves the problem.

Finally, you can replace the monitor and see if that solves the problem.

It didn't help me, it didn't work.

Dear,The above is useless to answer,You can change a monitor to try,If the new monitor also has a black screen and no signal,You can conclude that the graphics card of the host has a question,Need to send a new graphics card。

There are too few conditions to judge.

The display shows "no signal", which means that the display is generally good, and the rotation is not showing the signal.

There are generally 2 cases when the signal is not displayed

1. The computer has no attack and has a normal boot (generally there is a start-up self-test sound, and the panel has a power supply and hard disk light indication);