1. After the computer is started, regardless of whether the monitor can be lit or displayed normally, press the restart key on the host computer again, and then press the "Num Lock" key, which is the digital switch key on the right side of the desktop keyboard.
2. If the digital lock light on the digital ON key can be turned on or off normally, it means that there is nothing wrong with the computer host, and basically it is the monitor itself.
3. If the lights can't turn on and off normally, it basically means that there is something wrong with the hardware inside the computer case. In addition to pressing the "NumLock" key, you can also switch the key "Caps Lock" by case. & lt
4. If the problem is the USB interface in the keyboard, you can wait for a while after booting, that is to say, estimate how the computer should enter the desktop at this time. Of course, if you have a stereo, you can also plug it in and listen to whether there is a boot sound. If you can hear the boot sound normally, it also means that the display is not bright, which has nothing to do with the system and the host.
Second, the computer monitor is not bright: the boot failure caused by the monitor itself cannot be displayed.
1. Check whether the monitor is powered on. Many netizens will also encounter this small mistake that is not a mistake. Especially for large-head monitors, it is difficult to tell whether you have pressed the switch of the monitor.
2. In general, there will be a power-on indicator on the display screen. You can look for it on the display to see if it is turned on. Generally, it lights up directly when it is opened.
3. If the switch is still not lit, please check whether the power cord socket is electrified, try another socket, or try another power cord. Generally speaking, the power cord of LCD can be common with the power cord of rice cooker and main cabinet.
Generally speaking, if the main engine is frequently moved, when the light is off, it is likely that the power cord is in poor contact or the wire inside is broken.
Third, the computer monitor is not bright: check whether the VGA database of the monitor is plugged in.
1, when the power supply is ok. At this time, there is also some information on the monitor. For example, if the monitor shows "No signal", it is necessary to check whether the cable connected to the computer monitor is plugged in.
2. In addition, remember not to insert the VAG data line of the display line by mistake. If you have a discrete graphics card, you should plug it in. If not, plug in the integrated graphics card.
3. Some netizens may be independent graphics cards, but the display prompts "no signal", so there may be something wrong with the independent graphics card. First unplug the discrete graphics card, clean up the only golden finger, clean up the graphics card slot and plug it back in.
Fourth, the computer monitor is not bright: due to computer hardware reasons, the monitor can not display.
1, when this happens, it is useless to press the uppercase and lowercase keys or the numeric keys to switch, indicating that the motherboard cannot input and output signals normally. Then it's obviously a hardware problem.
2. Clean up the dust. If the machine is used for a long time, it is likely to be caused by dust. Sometimes it is good, sometimes it is wrong, which is very common. Disassemble the chassis and clean all the dust on the motherboard.
3. Poor contact of the memory stick. Memory stick is also a very common problem. When cleaning the dust, pull out all the memory sticks at the same time, then clean the memory stick slot and the gold finger of the memory stick.
4. Capacitance storm. Some capacitors on the motherboard will suddenly explode and also explode. Generally speaking, this problem cannot be solved by itself. You can only see with the naked eye that there is something wrong with the capacitor on the motherboard. Take it to the motherboard repair place.
5, discrete graphics card failure. If you have an independent monitor, you can pull out the independent graphics card and retest whether the signal can be output normally.
6. Minimum system method. If you have time, you can remove the motherboard, except CPU, CPU fan, power supply, memory and hard disk. Don't try again. If it still doesn't work, please report for repair.