The computer noise generation and solution I found myself, I hope it will help you (a little long) 1, * * * vibration; 2. cpu fan; 3. Power supply fan; 4. Power supply; 5. The voltage is unstable. Solve it from these aspects: 1, disassemble the chassis and clean up all the dust (especially in the northern region), preferably with a waste brush or a vacuum cleaner. 2. Remove the fixing screw of the CPU fan channel and carefully open the CPU radiator. You will find that the silicone ester in the gap between CPU and heat sink has dried up (which has a lot to do with the high power of CPU). Clean the dry silicone ester with a slightly wet cleaning pad and let it dry. 3. If possible, it can be supplemented with advanced silicone ester; If not, it can be supplemented by the following methods: squeezing a little white silicone ester on the glass, grinding and stirring the glass with a carbon pencil until the white silicone ester becomes light gray and slightly thicker, thinly coating a layer on the clean CPU with a blade, and installing a heat sink. Remember not to move the heat sink back and forth, so that the heat sink can make good contact with CPU. -The silicone ester made by this method is not much different from the special silicone ester made by Intel, and it has good thermal conductivity and is not easy to dry. 4. Carefully plug in the large fan, carefully remove the circular sticker with trademark in the center of the fan, you can see that the central axis is exposed, carefully cover it with vaseline (very cheap, sold in pharmacies), and carefully seal the circular sticker with trademark. -Principle: Vaseline is mostly applied to hands to prevent dry and chapped skin in winter. It has a characteristic: when the fan works, it will generate heat, and vaseline will gradually melt and penetrate into the fan bearing for lubrication. When the fan stops working, vaseline will solidify after the temperature drops and stand by. This method is better than adding any lubricating oil. 5. Mount the chassis, and put a slightly thicker rubber skin on the front and back of the chassis to play a role in shock absorption. 6. Try it on. It's not obvious at first, but in a week or so, you will find that the noise of your computer fan and chassis is getting quieter and quieter, which is basically the same as when you just bought it. 2) Expert analysis: The longer the computer is used, and the host is moved by some people, or the internal hard disk, fan and other components continue to run and rotate, sometimes the screws will loosen slightly, resulting in increased vibration and noise. In addition, if it is used for a long time, the rotating shaft of the fan will become drier and drier, and the rotating tone will be improved due to lack of lubrication. Quick fix: For this small problem, computer users who have not passed the warranty period only need to send the mainframe to the maintenance station for the manufacturer to repair it for you if they don't want to open the chassis to break the warranty seal. If you are a customer or the mainframe has passed the warranty period, you can open the chassis, tighten all the visible screws, add one or two drops of lubricating oil to the fan shaft, and dust the chassis by the way, so that the noise of your mainframe will be reduced a lot. 3) The main sources of computer noise are as follows: the vibration sound of hard disk power supply fan, cpu fan, graphics card fan and motherboard equipment comes from vibration, and only vibration can produce sound. There is no doubt that the loud noise of the host when the computer starts is caused by the strong vibration of some parts inside the host. A big factor is that both the power supply fan and the CPU fan are rotating when the computer is started. There are many reasons for the harsh start-up noise, but the main reasons are nothing more than the following: * * Vibration phenomenon caused by fans: A. The natural frequency of the system composed of chassis structure and power box installation structure is low (that is, the structural rigidity is poor). When the fan is running, the rotating speed gradually increases. When the rotating speed is close to the natural frequency of the system, the phenomenon of * * * vibration begins to appear. With the increase of the rotating speed of the fan, it is closer to the natural frequency of the system, but it vibrates. When the fan speed continues to increase, the fan speed gradually moves away from the natural frequency of the system, and the vibration gradually weakens and returns to normal. B. "Eccentricity" of fan blades: A high-quality fan has its blade center of gravity on the shaft, and it runs smoothly with little noise, while an inferior fan will have a certain deviation, and the blade center of gravity is not on the shaft, resulting in "eccentricity". After such a fan rotates, it is equivalent to an oscillator (the oscillator is to add an eccentric wheel to the motor shaft). With the extension of service time, the fan bearing. It may also be because the quality of the fan is not good and the lubrication is not good. At first, it turns rough, but when it turns alive, the lubricating oil inside becomes soft and the sound is reduced. C, the chassis structure is not tight: the hard disk is not in close contact with the chassis bracket, or the chassis steel plate is too thin, which is easy to make some annoying noises. The noise made by the power supply fan may be that the chassis is not closely matched with the power supply. The rotation of the power supply fan causes the chassis to vibrate. In addition, unstable installation of other hardware inside the chassis may also cause vibration. The weather is cold and the temperature is low: some fans use grease. When the temperature is low in winter, the grease in the fan will solidify. When the fan is started, the temperature of the bearing part is low, the viscosity of grease is high, and the rotation resistance is high, so the sound is loud. When the fan rotates for a period of time, the temperature of the bearing part rises and the lubricating oil begins to work. At this point, the noise situation will return to normal. This usually occurs in the first few minutes of startup. In this way, there will be no noise in other seasons. Supplement: the fan bearing is short of oil: if the sound is always loud, it means that the fan needs to be refueled. There is a round sticker in the center of the bottom of the fan, which can be opened to see the shaft inside the fan. Dip a toothpick in sewing machine oil (about the size of rice grains) and add it. Then apply adhesive. Including cpu fan, video card fan and power fan, you can refuel. If you don't know how to refuel, you can go to a computer repair shop and let professionals do it. Hard disk noise: Hard disk sounds are mainly loud, and poor quality hard disks will be louder, while too many hard disk fragments will increase the workload of hard disks and the sound will be louder. Another situation is that the hard disk has a bad track, which will also cause the hard disk to ring. When the common IDE hard disk is running normally, it will have certain working noise. However, these sounds are very small and will only be generated when reading hard disk data. Dust accumulation: a large amount of dust accumulated in the chassis, power supply and CPU heat sink will also increase the sound of the fan. You can try to debug the power supply slowly with a screwdriver to see if it works, and then see if the chassis layout is deformed. If there is any change, the source of noise is probably the power supply and CPU fan. All the above reasons are attributed to the fan. Therefore, we can solve the problem by the following methods: removing the dust from the chassis hardware, oiling the fan and fixing the internal hardware of the chassis, but we should also pay attention to the following points: 1. Pay attention to the lubrication of power supply and CPU fan. Because of poor quality and poor lubrication, some fans turn very astringent when they start. When they turn to life, the lubricating oil inside will soften and the sound will decrease. 2. Do not move the chassis when the computer is running. Chassis cover should be installed in place. If there are cracks, the chassis will vibrate and make a lot of noise when the computer is running. If the chassis is deformed, you can pad some soft things under the chassis, such as sponge, foam and other damping materials. 3. Don't disassemble the fan at will, it may be installed incorrectly, which will affect the rotation and make a lot of noise. If you don't understand, you can ask professionals for help. 4. Dust your mainframe regularly, usually once a year. Dust removal frequency can be appropriately increased in dusty places. If you lack dust removal equipment and are afraid of trouble, it is recommended to go to a computer repair shop to clean it up. 5. Cold weather and low temperature are a cause that can't be ignored. If this is the reason, it can be said that the machine is completely normal and there is no good solution. If it really doesn't work, you can increase the boot time in winter or not turn it off directly. Supplement: 6. The solution to the problem of "eccentricity" of fan blades is to install the fan firmly as far as possible so that it will not vibrate; Another method is to fill the bearing of the fan with oil to cushion the vibration, thus reducing the noise. The first two methods did not solve the substantive problems; The last method: take off the fan blade and lift the fan blade from the small hole in the center of the fan blade with fine iron wire. If one end falls off, it means that this end is heavy and can be ground on the grinding wheel several times. After that, when the fan blade is hoisted with fine wire, if the fan blade can stand still in the horizontal position, it means that the transformation is successful. The last one is more complicated. If the computer has a long service life and really can't solve the problem, replace the fan directly. Computer noise mainly comes from fans. Many materials have introduced the methods of oiling the fan to reduce the noise, but the noise of the fan is not necessarily caused by the lack of oil in the bearing. Therefore, it is necessary to comprehensively consider various situations, find out the real reason for the loud noise when the computer is turned on, and prescribe the right medicine to get rid of the disease.

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