Lenovo IBM notebook SL400 boot screen does not light up, but the power light is on, carefully observ

This is a pseudo-black screen (the screen has no backlight, you can see the image if you look carefully, and you can look at it with a flashlight), many pseudo-black screens with aging lamps sometimes re-switch the lamps, such as switching the screen can be re-lit for a while, basically 90% of the possibility is that the lamps are aging or insulation, and the lamps need to be replaced. There are other high-voltage boards or motherboard power supply or control signals that cause a false black screen, which can be repaired.

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Lenovo IBM notebook boot screen 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.

If this happens on your computer, you can try the following methods to solve it:

1. If there is a problem with the plug of the host, check whether there is a problem with the plug and socket and reconnect it.

2. There is a problem with the boot circuit of the motherboard, generally the triode, capacitor, and resistance of the boot circuit, there is a problem with the IO, there is a problem with the CPU power supply circuit, and so on, as long as these original components are replaced, you can do it.

3. The gold finger of the memory and graphics card in the host computer is oxidized, 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 hardware incompatibility, which leads to the failure to boot.

Dear users, hello.

You can try to unplug all external devices (including the power cord and battery) of the host, press the power button 5 times at intervals of 2 seconds, and then connect all external devices to power on for testing. This is how to release static electricity, and if static electricity is generated in your computer, the problem you described may arise.

If there is no effect, it is recommended to send it to the service station for testing in time.

Provide you with a link to the repair network inquiry.

Have a great day.

I've encountered a similar situation before, I don't know if I can help you.

There is a key on the keyboard of the notebook, which should be blue next to the cril key at the bottom left of the keyboard, and it is written as fn, remember, you will use it later. Other keys on the keyboard,Some also have blue logos (such as U,There's a blue 4 below),Some are patterns (F1 is sleeping zz),Okay,Hold down FN,Press and hold the keys with blue patterns from F1-F12 next to each other,Until the screen lights up (I don't know which key is specific?,You rule it out.,Don't press the volume with a speaker.,It's mainly a button like a hibernation screen.,My computer is fi hibernation.,F5-F8 is related to the screen.,You press this key related to the hibernation screen first. , no, try others).

It should be that the computer is hibernated or the screen is turned off.

PS: All the functions shown by the blue logo must be pressed and held down the fn key to use. In addition, if the external keyboard is turned on the keypad, then pressing the key with the blue logo on the notebook keyboard (it should only contain letter keys, such as U, I haven't tried F1 those, I'm afraid of problems) will use its blue logo function (press U, it will output Arabic numerals 4), at this time, hold down FN and then press and hold them will output white (such as U), and the external keyboard does not open the keypad, then the notebook keyboard is still the same.

If you find that the laptop keyboard outputs a blue flag one day, press the fn key and release it to solve the problem.

If it can't be solved in this way, look at the opinions of other netizens, or directly after-sales. Good luck.

Looking for a computer repairer, should there be something wrong with the graphics card or motherboard? I'm having the same problem as you, but my screen is blurred!!

It is estimated that it is a graphics card problem, which can be repaired, and it can be solved on the spot in Beijing.

A: Power supply, such as the use of inferior quality power supply, resulting in unstable voltage.

b: The memory module is faulty. Most of the memory sticks are oxidized back, and there is an eraser under the gold finger answer.

Find a desktop monitor connected to the VGA interface, see if the display is normal, if it is normal, it means that there is a problem with the display, the lamp is broken or the high-voltage package is broken. Just take it and fix it. If the external monitor doesn't show it either, it means that your machine is not starting up properly at all.