Second, both hardware failures and software problems, in a sense, are not isolated. Try to solve it according to the following ideas. I believe that the black screen will be properly solved soon.
1, when a "black screen" suddenly appears after the computer is turned on, please listen to the PC speaker in the computer first to see if there is an alarm sound. If the PC horn sounds an alarm, the hardware components that may have problems can be preliminarily judged according to the length of the sound.
2. If the alarm sound of the PC speaker is one long and four short when the computer is turned on, it is easy to judge that the problem is on the graphics card according to this prompt. If so, you can open the chassis to see if your graphics card is safely inserted. If you feel a little loose, please pull out the video card, insert it again, insert it tightly, and then fix it with screws. If the problem of insertion mode is eliminated and the card slot is firm, you can pull out the graphics card and try another slot on the motherboard. If the user's graphics card does not belong to PCI but is a new AGP slot board, and there is only one AGP slot on the computer motherboard, you can try another AGP slot on the motherboard to eliminate the physical failure of the graphics card. If the graphics card is inserted tightly and the physical fault is eliminated, then there is another possibility that the "golden finger" of the graphics card itself has a problem in normal contact. If this is the case, you can pull out the display card again, and then find a clean rubber to rub it back and forth on the "golden finger", because most of the poor contact problems of this "golden finger" are caused by some dirty things on it.
3. If the alarm sound of the PC speaker is not long and short when the computer is turned on, but a short and urgent call, and there is a black screen, then it can be roughly judged that there is a contact problem in the computer memory according to the phenomenon. The solution to poor contact is basically the same as the graphics card, that is, pull them out and plug them in again. When inserting, be sure to insert it to the end and fasten the clips on both sides of the memory stick. SDRAM slots on some motherboards are troublesome, because most of the slots on these motherboards are very tight. If the user encounters this situation, he must not use force. They can press the bottom of SDRAM slot on the motherboard with their fingers, and then press the memory with their thumbs. Hearing a slight noise proves that the memory has bottomed out. Finally, they can fix their memories with clips.
4. There are some black screens in which the computer will not give an alarm. At this time, the simplest thing is to analyze the specific problems according to the mathematical "exclusion method". Check whether there is any problem with the power terminal board before removing the relevant supporting parts of the computer.