Black screen, power indicator on, what s the reason

Problem analysis: There are two situations when the computer is turned on and the black screen is not: 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 cord is in poor contact or damaged, and the latter is generally due to loose or oxidized memory modules and poor contact, 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 don't know how to operate, then it's simple: slap 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 has no interface at the back; Attention Tract:

Don't push too hard, and certainly 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.

The LCD TV screen is black, but the indicator light is normal, what is the problem?

The reason why the power button of your Lenovo laptop is on but the screen is black is that the computer may be asleep, and you try to wake it up by pressing the power button or the keyboard spacebar. If it is not in the sleep state, it may be that there is a bug in the system that causes the computer to freeze or freeze, try to force shut down and restart.

If the indicator light is not yet on, on the premise of ruling out the power adapter, it must be that there is a problem with the power chip of the motherboard or a short-circuit breakpoint, and the motherboard is not powered.

Reasons for the black screen of a computer laptop:There are many reasons why a laptop has a black screen, the main ones being a damaged monitor and a damaged motherboard. Of course, the phenomenon of black screen can often be seen, if your laptop is used for a long time, it will cause damage to the graphics card, poor contact, and parts because of the high temperature and the screen can not be displayed, or artificially destroy the computer, so the phenomenon of computer black screen will appear.

This phenomenon is not terrible, and there are many ways to put your computer back to its original state.

The monitor does not turn on the power, the solution; You need to check that the power supply of the display is connected and that the display is turned on. Check that the power cord is secure and try to plug it back in. The host is working normally, the power indicator of the monitor is on, but the monitor screen is black, it may be that the transmission line connecting the computer monitor and the computer host is loose or broken.

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The power light of the computer is on but the screen is black.

What should I do if the computer is turned on and the screen is not lit.

Hello dear, I'm glad to answer for you, I'm your exclusive ** answer teacher, thank you for your patience! The reason why the power light of the computer is on but the screen is black: the power is not turned on on the monitor, and the solution is stupid; You need to check that the power supply of the display is connected and that the display is turned on.

Check that the power cord is securely clumped and try to plug it back in. The host is working normally, the power indicator of the monitor is on, but the monitor screen is black, it may be that the transmission sock cable connecting the computer monitor and the computer host is loose or broken. We hope you find this service <>helpful

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When the computer is turned on, the screen is not on, check whether the monitor has been turned on. Check that the power cord is secure and try to plug it back in.

The reasons for the power light of the computer to turn on but the black screen are that the graphics card is loose or damaged, the memory slot is not in good contact, and the power supply circuit of the computer motherboard is abnormal.

1. The slag graphics card is loose or damaged.

If the independent graphics card storage of the computer graphics card is loose or soldered, the computer graphics card will not work properly, resulting in the computer power supply being smooth, but the screen will be black. In this case, the graphics card can be unplugged and plugged in; If it is found that there is a phenomenon of false welding, it needs to be sent to the maintenance office for maintenance.

2. Poor contact of memory slots.

Poor contact of the computer's running memory slot will cause the computer to have a black screen and cannot be turned on. At this time, you need to remove the slot where the memory is running, and at the position of the gold finger of the memory, that is, the area where there is a metal sheet, wipe it back and forth with an eraser, insert it back, cover the back cover, and it can generally be solved by booting.

3. The power supply circuit of the computer motherboard is abnormal.

There is an abnormality in the power supply circuit of the laptop motherboard, such as clocks, calibration, power distribution. Or the MOS tube is abnormal, and the screen is black. In this case, it is necessary to send the computer to after-sales service or repair the computer motherboard.

Tips for computer maintenance

1. Normal shutdown.

This point is the point that everyone is most likely to ignore, open a lot of background programs in the office, save trouble when shutting down, and force shutdown, which will affect the normal reading and writing of the hardware, resulting in information loss, and in serious cases, it will cause permanent damage to the hardware. It is also necessary to avoid sudden power failure, which will cause irreversible damage.

2. Maintenance of LCD screen.

It is recommended to turn on the power-saving mode on the computer LCD screen, and the computer will automatically turn off the screen when not in use, which can not only save power, but also extend the life of the LCD screen. At the same time, it is recommended to use a special detergent for daily wiping and cleaning.

3. Avoid vibration when using.

The computer should try to work on a flat table or platform in daily use, and remember to handle it gently when moving, to avoid bumping, if it is easy to bump, the most serious consequence is to damage the hard disk, so try to be equipped with a special notebook bag, because the special notebook bag has been treated with shock absorption, which can effectively protect the hardware security.