After turning on, the display is on, but it doesn t light up after entering the system, and it will

It could be for several reasons:

1. The monitor is broken (the reason for the display motherboard).

2. The monitor cable is loose or the cable is broken.

3. The color of the monitor is too dark, so it can't be seen.

4. Computer failure, (you may need to redo the system).

5. Restart and try.

6. Too much dust.

7. Hard disk reasons.

8. Reason for memory module.

It depends.

Hello, it may be a dark screen failure: when the LCD is turned on, the screen will be black, first try to look at the screen with a flashlight to see if you can see the image, if you can see the image, this is the dark screen failure, most of them are the problem of the lamp. This is due to the capacitance bulge at the output end of the power supply circuit part, the phenomenon of leakage, or the short circuit of the high-voltage package, the open circuit of the high-voltage coil, the resistance may be damaged, the switch control tube is broken, or the lamp is damaged, there will be this phenomenon of turning on the boot and turning on the black screen immediately, and the lamp is very likely to be damaged.

Causes and solutions:

1. Check if the keyboard light is on, press the numlock or uppercase toggle key on the upper left corner of the keypad to see if the keyboard indicator responds. If so, pay attention to the sound of the system starting. If the keyboard light is responsive, it means that the system boots up normally, but it just doesn't show up.

2. If the graphics card is in poor contact, you need to turn on the host, take out the graphics card, wipe the connection point to wipe off the oxide film, and then install it well, and then turn it on.

3. Judge whether the host starts normally, if the host is completed normally, there will be a dripping sound. If there is no normal self-test, please check the hardware, if the keyboard does not detect it, it will not affect the machine display, but the BIOS will report an error.

4. If not.

Here's how to fix it:

1. Open the case and find the memory module.

Open the live clasp, remove the memory module, wipe it clean and put it back in;

2. Open the chassis to find and remove the battery, reverse the battery to connect the positive and negative poles for 30 seconds and then turn it on;

3. Loosen the screws and screwdrivers on the motherboard.

Twist it for one or two turns, and then gently turn the motherboard on;

4. If the above methods cannot be turned on after trying, report the situation to the merchant to apply for after-sales service or seek help from professionals.

Problem Analysis:

There are two situations when the computer boots up the display: 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 on, or the power interface or power cable is in poor contact or damaged, and the latter is generally due to loose or oxidized memory modules and poor contact, or the display data cable is not in good contact, or the memory, graphics card, display or data cable is damaged.

Handling suggestions:1If the monitor is powered on but no signal is displayed, turn it 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), turn on the chassis after powering off, replug the memory module, and wipe the gold finger with an eraser in one direction (the back of the thumb fingernail is also fine), and then turn on the power 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.

1.The boot display screen is black, the indicator light is on, and the host does not have any reaction. I can't feel the fan spinning behind my hand behind the main unit. None of the voltages are measured. Remove it and find that the power adjustment tube is broken, and replace it with normal.

2.The long sound alarm at boot should be a memory failure. Unplug the memory, clear the gold finger, and insert it normally.

3.The power supply and CPU fan are normal, but the screen is unresponsive and there is no self-test sound. This machine adopts slot1 structure, the CPU contact is poor, and it can be reinstalled.

No. 1: Is the light on the display still on?

If it's on, then you turn it on again, you can show the brand of the display, that's a problem with the graphics card, I've also had this kind of problem, change the graphics card, good 300-500 general 80-120, the owner of the tower adopts.

The black screen of the monitor is flashing, which means that the computer host has no signal output.

You reinsert the graphics card.

Try memory. Or try someone else's graphics card memory.

If you can't use someone else's, it's a problem with the motherboard.

Most of this situation is a problem with the memory module, take out the memory module and wipe it gently with an eraser, and use this method when installing it back, most of the display screen is not lit, if it doesn't work, then you must repair it at the repair place.

First of all, see if there is a network or not, whether it is standby, and then check whether the plug is in place, there may also be poor contact, whether the host is running, if these are all right, it should be a problem with the internal parts of the display.

It should be a problem that the graphics card priority cannot be saved in the motherboard settings, and the constant change may be the reason why the CMOS battery on the motherboard is dead.

(1) After the computer is turned on, the LCD screen will be black when it lights up, which is a problem with the LCD screen, including two types of dark screen failure and black screen failure.

2) The first type: dark screen failure: when the LCD is turned on, the screen is black, first try to take care of the screen with a flashlight, see if you can see the image, if you can see the image, this is the dark screen failure, most of them are the problem of the lamp.

This is due to: the capacitor bulge at the output end of the power supply circuit part, the phenomenon of leakage, or the short circuit of the high-voltage package, the open circuit of the high-voltage coil, the damage of the adjustable resistance, the breakdown of the switch control tube, or the damage of the lamp, will appear this kind of boot light, immediately dark screen phenomenon, the lamp is the most likely to be damaged. Solution:

Replace the lamp.

3) The second type: black screen failure: when the computer's monitor lights up when it is turned on, the screen goes black.

If the flashlight does not see the image on the screen, it is a typical black screen failure. Generally, the black screen is the failure of the power supply circuit and the driver board circuit, such as the leakage, bulging, and leakage of the large filter capacitor of the power supply circuit, the performance of the power supply chip declines, and the power supply is closed and the inside of the tube is short-circuited, and the filter electrolytic capacitor at the output end of the power supply is bulging, leaking, and discharged, and the performance of the MCU chip of the drive circuit is reduced, and the power supply is stable and the voltage regulator is in trouble, and there will be a black screen failure. Solution:

Repair the power circuit, drive circuit and components mentioned above.

The computer is turned on but the display screen does not light up, these reasons will teach you how to solve it!

First, try the cable.

If there is no problem, look at the display indicator light and see if it is on, if it is on, it means that it is not a problem with the display. When the display suddenly doesn't light up, it's black or in DOS. If it is a black screen, it is recommended to turn off the power, turn on the case, unplug the memory module and wipe the gold finger, and then plug it in, all the cables connected to the motherboard are also unplugged, and then plug it back in according to the position, if it still doesn't work, buckle the small battery on the motherboard and put it on for a few minutes, and then press it to try to reboot.

Is the keyboard light on? If it's on, try to change the monitor first.,If the symptoms are still the same, it's a problem with the host.。 Remove the power supply, take the tweezers and short the black wire and the green wire, if the fan can be turned is the problem of the motherboard, you estimate that it is not repaired well, it is recommended to send it for repair.

If the price is too high, it is recommended that you get a new motherboard. Thank you for adopting. Seek adoption.

Maybe it's a virus.

It is recommended to find a professional to repair it.