Lenovo computer display not lighting up why

The laptop screen is black, it may be a problem with the software or hardware.

One, the black screen caused by the software.

Sometimes after installing some software or hardware drivers, you find that after restarting, the computer can't enter the system and the screen has been black, which is the black screen of the laptop caused by the software. If it is due to software that causes a black screen, then to:

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For example, you can restart the machine and press the F8 key several times when the system is turned on to bring up the system's startup options menu.

Once the System Boot Options menu comes out, select Enter Safe Mode. If you can enter the safe mode normally, you can delete the software or driver installed before the black screen in the safe mode. Then restart the machine and see if the laptop can fix the black screen issue.

Second, the hardware causes the laptop to have a black screen.

Hardware-induced black screen for the following reasons:

1) The cause of static electricity, sometimes static electricity will cause the circuit of the notebook motherboard to be abnormal, resulting in no reaction on the screen after the power is turned on. You can try to turn off the battery and power of the laptop, and then press the power start of the laptop several times to let the machine release the static electricity. Then connect the power supply, turn it on, and see if it can solve the fault.

2) The memory is loose or the memory has a hardware failure. There are several major components of a notebook computer, including:

CPU, motherboard, memory, graphics card. These parts are indispensable, as long as one of them has a problem, it will cause the laptop to not function properly, the most common is that the boot does not respond. In general, the probability of CPU and motherboard failure is relatively small, and it is more common for the laptop to fail to boot due to loose memory.

At this time, first remove the battery and power supply of the notebook, if it is not difficult to remove the computer, you can open the back cover of the notebook by yourself and reinsert the memory. After plugging in the memory, power it on again, start the machine, and see if you can solve the fault.

3) The LCD part of the notebook is faulty. There are some notebooks that are a little older, and this may be the case. Display components generally include displays, data cables, and some other small parts. If you have a desktop monitor, try plugging it into a laptop.

VGA display interface, and then switch the display to on the laptop.

VGA external display. If you can switch to an external monitor, it means that there is a big problem with the display part.

4) The graphics card hardware is faulty, the graphics card is responsible for the source of all the display output of the computer, so it has a problem, and there is no display on the screen. If the graphics card is broken, the average user can't solve it, and the only way to solve it is to find the computer's after-sales service. If the notebook is within the warranty period, it can be taken for free inspection and repair.

The keyboard case is pressed to see if the light is on, the display is not lit, it is the host problem, and this season is generally the memory module is loose.

There are several reasons why the laptop can turn on, but the screen doesn't light up

1. Sometimes the laptop is turned on, but the display does not light up, which is generally due to the failure of the motherboard self-test or the problem of the screen lamp.

2. First of all, we must determine whether it is a real black screen or a pseudo black screen, the pseudo black screen is that the screen backlight is gone, and you can see the words on the screen if you look closely.

3. If it is a pseudo-black screen, it is generally that the lamp is broken and the lamp needs to be replaced. It is recommended to go to a professional repair shop for repair, if it is still under warranty, then it does not need to be cost.

4. If it's a really black screen, it's basically a broken graphics card or South Bridge. You can connect an external monitor to see,It's connected to the VGA port of the notebook,If the external monitor is also like this,It's basically a problem with the graphics card。 If the external monitor is normal, then it is the problem of the screen itself or the screen cable.

There is a 20% chance of a problem with the screen itself or a screen cable, and an 80% chance of a graphics card failure. Because the external output and the laptop screen output are two independent output modules. If the graphics card is broken, a replacement graphics card is generally fine.

Expand your knowledge. Workarounds for computer screen not showing:

1. It is not appropriate to update the graphics card driver, it is recommended to reinstall the system for testing.

2. Replug the monitor connection cable tightly;

3. If it is a discrete graphics card, it is recommended to check whether there is a capacitor on the graphics card that has exploded, and if there is, it needs to be sent to a computer store for repair;

4. Change a monitor to test it to see if it is a problem with the monitor.