What's wrong with the computer watching video with black screen and sound?
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". First, check whether there is any problem with the power terminal board, remove the relevant supporting parts of the computer and replace them with some other equipment that can be used to check whether the power terminal board works normally. If there is nothing wrong with the power terminal board, then check whether the connection between the computer power supply and the motherboard is normal according to the normal procedure, that is to say, check whether the motherboard power supply is normal. If the socket is not connected by mistake, check whether the power supply is burnt out. If the power supply burns out, the power supply fan will also stop running. In some early computer cases, the power supply was often insufficient. If this problem is suspected, please unplug all power cords from the hard disk, CD-ROM drive and floppy drive, and then restart the computer. After the power consumption rate is greatly reduced, see if this situation is solved.
5. If the problem still cannot be solved, please rule out that the motherboard BIOS is accidentally damaged by viruses such as CIH, and whether the motherboard is in poor contact or the welding head is short-circuited. In addition to the above, with the continuous improvement of CPU frequency speed, power supply plays an increasingly important role in the whole PC power supply system. Some people describe the central processing unit as the heart of a computer. They may be too concerned about whether the heart is healthy and strong for a long time, but ignore the chassis power supply that can provide power and energy for the heart. However, due to the lack of power supply, it may also cause the computer to have a black screen. The symptom is that you can hear the chassis power fan start normally after starting, but you can't hear the "drip" sound of system error, but the machine doesn't work, there is no self-test process, and a black screen is displayed.
6. If all boards and memories are plugged and unplugged again after cutting off the power supply, make sure that all boards or components are not loose, which is mostly caused by insufficient power supply. Don't neglect the chassis and power supply when buying a computer. Buying a power supply with a rated power of more than 250 watts is a kind of care for the machine.
7. If there are many peripherals installed on the computer, such as dual disks, dual CPUs, dual optical drives, SCSI cards, etc., it is best to find a more powerful (300 ~ 400 watts) or server power supply. As for users of P4, Thunderbird and GeForce3, they must use more than 300 watts of power, otherwise things more troublesome than black screens will emerge one after another.
8. The phenomenon of black screen is mostly caused by a hard injury on the PC, but it is not absolutely so. Soft injuries may sometimes be easier to deceive users. In the process of using the computer, after entering WINDOWS 98/WINME/WIN2000 or even WINXP system, some black screen phenomena may also be soft faults.
9. The most obvious problem here is the program failure caused by the hardware driver problem. This kind of problem frequently appears on some third-party boards such as 3D accelerated graphics card, PCI sound card, network card, SCSI card and RAID card, and the most obvious manifestation of this kind of problem is that applications and game software frequently crash during operation, resulting in black screen. This paper analyzes the reasons for this problem, mainly because the power of standard 3D acceleration chips or higher-end, newer non-mainstream 3D acceleration chips is ignored when writing the game source program, so the hardware support of the game itself is not satisfactory, which also affects the performance of the product. Another example is PCI sound card, PCI network card and so on. Because of the conflict between driver and system application, the machine suddenly appears black screen or restarts. Readers can solve this problem by installing updated drivers.