The power flashed and the computer display didn t light up, what s going on

Failure analysis of the display not lighting up.

The failure of the black screen of the display is relatively common, which is often manifested as the display has no image display after booting, but the sound of "beep" has been heard when the host is started normally; Or when you are using it, the monitor suddenly goes black; There are also cases where the computer boots up normally, but a black screen appears when booting to a certain step. Because once the screen of the display is black, you can't see any prompt information, and you can't deal with it accordingly to solve the problem, which is generally a headache.

Fault Cause Analysis and Troubleshooting:

One. Display.

The black screen is caused by the display itself and cannot work normally, such as the power cord of the monitor is faulty, the power plug is in poor contact (note: both ends are possible), the power switch is broken, the internal circuit of the monitor is faulty, etc.

Two. Signal lines.

The 15-pin D-shaped plug connection mode used by the display used by the PC, the 13th and 14th pins are the line field synchronization signal, and the display decides whether to open the filament and the high-voltage power supply path by judging whether these two signals are present, and these two signals are used as the transmission signal of the display mode through the positive and negative polarity combination of the signal and the difference in the line frequency. If there is a gap between the two signals, the power indicator of the display is green, but there is no image display; If it is completely absent, the power indicator of the monitor is orange and there is no image display. For this case, the main check whether the D-shaped plug of the display signal cable has broken pins, crooked needles or short pins, and then there are broken wires inside the signal cable.

The solution is to replace a good quality signal cable.

In the power management of the CMOS settings of the computer, there is a "video off method", in which there are three options of "V h sync+blank, blank screen, dpms", the first of which is to select the output line field signal of the graphics card to control the power saving mode of the display.

Three. Graphics card The most directly related to the display is the graphics card, if the graphics card has no signal sent or there is a signal that cannot be sent, then the display will not light up. In actual use, the graphics card is not compatible with the motherboard, the signal output socket of the graphics card is not in good contact or loose, and then the graphics card is damaged, and the graphics card is not in good contact with the AGP slot of the motherboard, which will cause the display to not light up.

For the elimination of such faults, you need to be careful and patient, carefully check the contact between the graphics card and the motherboard, and whether there is any unstable contact. Incompatibilities can only be judged based on experience and data.

Four. Power supply When we configure the machine, we always spend more money on the CPU and memory, but we always buckle the door on the power supply. But the power supply is the power source for all the parts of the computer, if it goes wrong, will the other parts still work?

As we all know, if the power supply fails, the host will have a continuous short "beep" alarm and the display will not light up. However, there were times when there was no word, and in the end, it turned out to be a problem with the power supply.

This should be a memory problem.,Or the cable connecting the host to the monitor is not connected properly.

The reasons and solutions for the computer display not lighting up are as follows:

1. If the host is not lit, check the host power supply: when the display is not lit and the black screen has no image display, check whether the host power supply is plugged in well, because if the host power supply is not working or the motherboard is not powered, the display will not have an image display when it does not receive a signal.

2. Display data cable problem: check the data cable of the display, which is a problem often encountered by many users, when connecting the D-type socket, the force is uneven, or forget to tighten the fixing screw of the interface, so that the interface is loose and causes poor contact, or due to improper installation method or excessive force, there are broken needles or bent needles in the D-type interface, resulting in poor contact.

Computer display.

The reasons and solutions for the screen not lighting are as follows:

1. If the host is not bright, check the host power supply: when the display is not bright and the black screen is not displayed with an image, check whether the host power supply is well plugged in, because if the host power supply does not work or the motherboard does not have power supply, the display will not have an image display when it does not receive a signal.

2. Display data cable problem: check the data cable of the display, which is a problem often encountered by many users, when connecting the D-type socket, the force is uneven, or forget to tighten the fixing screw of the interface, so that the interface is loose and causes poor contact, or due to improper installation method or excessive force, there are broken needles or bent needles in the D-type interface, resulting in poor contact.

Why does the computer display not light up, the power light flashes and flashes, it means that the host does not start normally The hardware problem, (the biggest possibility is: memory sticks, graphics cards and other hardware poor contact) The solution:

Step 1: First of all, check whether the external wiring of the computer is connected, and plug in each cable again to see if the fault is eliminated.

Step 2: If the fault persists, then open the main chassis to check whether there is any excess metal in the chassis, or a short circuit caused by the deformation of the motherboard, and 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.

Step 3: If not, clean the dust on the motherboard, unplug the memory module, graphics card, and other interface cards, wipe the gold finger, and then reinsert it so that the gold finger is in good contact. Then check if the computer is OK.

Step 4: If the fault persists, unplug the reset cable on the motherboard and connect it with other switches and indicator lights, and then use the change cone short-circuit switch to see if it can turn on.

Step 5: If you can't turn on the computer, then use the minimum system method, unplug the data cable of the hard disk, floppy drive, and optical drive, and then check whether the computer can be turned on. Then connect the above devices to the computer one by one, when connecting a certain device, the fault will recur, indicating that the fault is caused by this device, and finally focus on checking this device.

Step 6: If the fault persists, the fault may be caused by devices such as memory, graphics card, CPU, motherboard, etc. Then, use the plug-and-unplug method, the swap method and other methods to check the memory, graphics card, CPU and other devices respectively.

After attempting to force the shutdown, disassemble the chassis and replug the memory and graphics card to check whether the fault is resolved.

If you still have questions, continue to ask.

It may not have been pressed on the computer monitor, and it may be broken.

Check whether the power cord at the back is loose and whether the main chassis has been opened.

The brick family gives you the answer. Display DU

Not lit. There are two reasons why the power indicator flashes and flashes, first, it indicates that the display is not working properly. It is said that the display is not receiving a signal.

It's just that there is no HS vs signal. (line, field signals). The second display voltage is pulled to the bottom, and the high-voltage strip is not working.

The CPU on the driver board is not working.

To solve this phenomenon. You have to solve it step by step, first, first see if the monitor is broken. Re-turn on the power of the monitor, and there are no signal words.

If not, it's a monitor issue. If there is a few words without signal. It's a computer problem, no output.

Your question doesn't make it clear whether the monitor, the computer is working.

Is the power connector loose?

I have the same problem with my Great Wall LCD monitor, and after disassembling the monitor, I found that the capacitors on the circuit board were bulging (capacitor failure). Hope it helps.

Summary. 1. Confirm whether the reset button on the main unit is stuck.

2. Check whether the signal cable of the display is connected to the host, whether it is connected well, and whether there is any wrong connection.

3. Turn on the power switch of the display, whether the power indicator of the display is not lit or flashing, and whether you can hear the sound of the host powering on normally.

The computer monitor is powered on, the power light keeps flashing, but the screen doesn't light up.

1. Confirm whether the reset button on the main unit is stuck.

2. Check whether the signal cable of the display is connected to the host, whether it is connected well, and whether there is any wrong connection.

3. Turn on the power switch of the display, whether the power indicator of the display is not lit or flashing, and whether you can hear the sound of the host powering on normally.

4. Whether the contrast and brightness of the display are adjusted too low, and the automatic mode of the display is resumed. 5. Remove all external devices, including keyboard and mouse, and leave only the monitor cable, and if the screen does not light up, the display screen is broken.

1. Check whether other boards (including sound cards, decompression cards, and capture cards) are in good contact with the slots of the motherboard Pay attention to check whether the data cable and power cable of the hard disk are connected correctly. For the slots of other boards, clean the pins. It is also easy to cause failure without display.

2. Check whether the contact between the memory module and the motherboard is good, and whether the quality of the memory module is excellent.

Hello dear, the above is my reply, I hope it can help you, I wish you a happy life!