What to do if the computer turns on the computer display detection signal line 20

There are four main reasons for this:

The first main reason: that is, the connection data cable between the computer host and the LCD screen is off or the connection cable is damaged, a black screen will appear, and the detection signal line will be displayed, you can dial the connection cable back up and plug it in, and then turn it on again, you know, if it is normal, it is this connection that falls off. If the problem persists, see the reasons below.

The second main reason: is that your memory and the graphics card and the motherboard slot contact is poor, for example, you are moving the host, accidentally brought to the graphics card, resulting in poor contact, so you just need to open the computer host, use the eraser to align the gold finger of the memory (that is, the part with the copper sheet) on both sides of the wipe a few times, and then plug it back, if there is a separate graphics card, also use the same method to deal with it, and then install the chassis, plug in the wire, generally deal with it like this, you can OK, The third reason: 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 the graphics card is repaired or replaced.

The fourth reason: the problem of power supply, when the filter capacitor of the power supply is bulging, leaking, when the power supply is insufficient after starting, it will cause the power supply to start self-protection, power failure, no electricity, naturally it is a black screen, your is likely to be the first and second reason.

The signal cable is not connected properly or there is no signal input!

The computer boots up the display with a black screen and displays a "detection signal line", which is generally due to poor contact due to loose or oxidized memory modules, or poor contact with the display data cable, or damage to the memory, graphics card, monitor or data cable.

Handling suggestions:1Shut down (if short press 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 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 turn on after installation (before operation, you should also touch the wall with both hands to release your static electricity or wear anti-static gloves).

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, plug in and replace the graphics card again, and plug in the data cable between the monitor and the graphics card (blue connector and cable in the figure below). 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 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.

The computer's boot display displays the detection signal line. The computer's monitor displays a detection signal cable, indicating that the main unit is not connected to the monitor. You can detect from the following aspects, is the power of the first display turned on?

Is the cable between the monitor and the host computer connected? Is the console turned on? Is there a problem with the graphics card of the console?

1. It may be that the data cable of the computer monitor is in poor contact and the cable is loose. The screen line of the computer display screen is broken or the contact is poor, resulting in no image signal being transmitted to the screen for display"Detect the signal line"or cause a black screen to occur. In this case, you can check whether there is a problem with the data cable and screen cable of the screen, if there is a broken or messy wire, you can let the professional maintenance personnel replug the screen cable, replace the screen cable, or replace the computer screen.

2. It may be that the computer's memory module or graphics card is loose or oxidized, resulting in poor internal hardware contact. In this case, you can pull out the computer's memory and graphics card, use a soft cloth to wipe and clean the interface, plug it in and boot it to solve the problem. If the memory module or graphics card is damaged, replace it with a new one.

The memory and graphics card of the computer that has been used for a long time will be oxidized, resulting in poor contact between the memory slot and the graphics card slot, or even damage, resulting in the occurrence of the problem"Detect the signal line"If a prompt or black screen occurs, it can be solved by replacing the parts.

Questions. The computer does not need to be plugged into an HDMI cable.

The computer does not need to be plugged into an HDMI cable.

Look at yourself with an HDMI cable or not, whether you need it or not. If you don't have an HDMI port on your monitor or graphics card, you don't have to use HDMI.

Questions. Do you need to plug in HDMI on the graphics card and monitor, and what does it have if you don't plug it in?

Do you need to plug in HDMI on the graphics card and monitor, and what does it have if you don't plug it in?

If your computer uses HDMI mini output, it will not be displayed if you do not connect to the monitor (indicating that there is no signal).

Questions. The computer monitor shows that HDMI1 has no signal, does it need HDMI2 cable?

You'll have to try it one by one to find out.

Questions. If I can try and ask you what to do, the HDMI cable is plugged in or the detection signal cable is displayed.

Then look at my original plan

This situation is obviously that the host has not been detected, and it is generally a hardware problem, such as the motherboard, CPU, memory, graphics card and power supply, and this phenomenon will occur if there is a problem.

The reason why the detection signal line appears when the computer is turned on is:

The connection between the display data cable and the host graphics card is loose, the connection between the display data cable and the display is loose, the contact is poor, the home environment is too dry, and a large amount of electrostatic charge accumulates near the interface of the host graphics card, which interferes with the transmission of the display signal and causes the illusion of poor contact of the signal line.

Solution: Turn off the power of the display, and then unplug both ends of the data cable and plug it in again, if there is a phenomenon of "electricity" during operation, you need to improve the environment, increase humidity, or install a grounding wire.

The computer monitor prompts "detect the signal line", there must be a problem with the computer hardware, and it is best to use the replacement method to eliminate the problem

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.

Summary. 1. If there is a detection signal line on the computer screen, the signal of the computer host has not been transmitted to the monitor, please check the connection of the VGA cable. 2. Generally, this situation is a problem with the graphics card or display screen.

It is mainly caused by the unstable operation of a certain component. 3. If the connection data cable between the computer host and the LCD screen is taken off or the connection cable is damaged, a black screen will appear, and the detection signal line will be displayed. 4. The memory and the slot of the graphics card and the motherboard are not in good contact, such as in the mobile host, accidentally brought to the graphics card, resulting in poor contact, so as long as the computer host is opened, use the eraser to align the gold finger of the memory (that is, the part with copper sheet) on both sides of the rub a few times.

Excuse me, but please go into more detail?

1. If there is a detection signal line on the computer screen, the signal of the computer host has not been transmitted to the monitor, please check the connection of the VGA cable. 2. Generally, this situation is a problem with the graphics card or display screen. It is mainly caused by the unstable operation of a certain component.

3. If the connection data cable between the computer host and the LCD screen is taken off or the connection cable is damaged, a black screen will appear, and the detection signal line will be displayed. 4. The memory and the slot of the graphics card and the motherboard are not in good contact, such as in the mobile host, accidentally brought to the graphics card, resulting in poor contact, so as long as the computer host is opened, use the eraser to align the gold finger of the memory (that is, the part with copper sheet) on both sides of the rub a few times.

Check that the VGA cable (the one that connects the computer to the monitor) is not damaged, and then that it is plugged in tightly. If there is no problem with the above, then the host has no signal input (which should also be this problem), this situation is caused by the failure of the host, and the common fault is that the BIOS cannot be started normally due to poor contact of the memory module. The solution is to turn on the main unit, take out the memory module, wipe the gold part below with an eraser and then install it.

Should solve the problem.

Unplug the power supply, press and hold the power button for 10 seconds, and the test is effective.

The detection signal line when the computer is turned on is: the display data cable is loosely connected with the host graphics card, the contact is poor, the display data cable is loosely connected with the display, the contact is poor, the home environment is too dry, and a large amount of electrostatic charge accumulates near the host graphics card interface, which interferes with the transmission of the display signal and causes the illusion of poor contact of the signal line.

Turn off the power of the monitor, and then unplug both ends of the data cable and plug it in again, if there is a phenomenon of "electricity" during operation, it belongs to the third problem, you need to improve the environment, increase humidity, or install a grounding wire.

1. Check whether the connection between the monitor and the graphics card (especially if there is a separate display and a centralized display, do not connect to the integrated display) is correct and whether the contact is good.

2. Check whether the graphics card and the motherboard are in good contact, whether the graphics card is working properly, clean the gold finger of the graphics card, and try to plug and unplug it again.

3. Check that the host is not turned on normally due to problems such as poor memory contact (the hard disk light does not jump, and there is no sound entering the system [if there is a speaker]).

4. Try to connect the host to another monitor, if it does not light up, it proves that it is a problem with the host, and use the replacement method to check the graphics card, memory, and motherboard to find out the damaged hardware.

5. If you can display it when you connect to another monitor, it is still the same if you replace it with the original monitor, and the display is damaged and needs to be repaired.

There are likely four main reasons for this:

1.The connection data cable between the computer host and the LCD screen is disconnected or the connection cable is damaged. You can dial the cable up and back in again, and then turn it back on;

2.The memory and slots of the graphics card and the motherboard are not in good contact. Turn on the main body of the computer, use the eraser to align the gold finger of the memory (that is, the part with copper sheets) on both sides of the wipe a few times, and then insert them back;

3.The graphics card's video memory is soldered, the main chip's virtual energy is reduced, the graphics card's BIOS is disordered, and there is a problem with the control power supply, causing the graphics card to fail to work normally. Jianyi repairs the graphics card, or replaces the graphics card;

4.The filter capacitor of the power supply is bulging and leaking, and due to insufficient power supply, the electric monitoring returns to the source to start self-protection. It is recommended to replace the battery and play the computer less with the power plug in.

After the desktop is turned on, the display displays the detection signal line, and the reasons and solutions for no signal are as follows:

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, and black screen.

Solution: Just plug in the connected cable again, or replace the cable.

The second reason: due to the cheat in memory or discrete graphics card.

An oxide layer is formed on the surface, resulting in poor contact between the memory and the memory slot, and 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 to the part of the gold finger (that is, where there is a copper sheet,) wipe back and forth a few times, and then insert back into the memory slot (or insert it back into a 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, (take the memory ** as follows:)

The third reason is the video memory of the graphics card.

If there is a virtual soldering, the performance of the main chip is reduced, the BIOS of the graphics card is disordered, and there is a problem with the control power IC, it 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 fourth reason: there is a problem with the boot circuit of the motherboard, such as clock, reset, CPU power supply, and MOS tube.

and so on, there is a virtual welding failure, which may cause the failure to turn on, as well as the problem of virtual welding in the south bridge, etc., there will often be no ability to turn on, the display can not receive the signal, and there is no signal, etc., the treatment method: is to repair the motherboard, (if in the warranty period and after-sales service).