1. *** vibration; 2. CPU fan; 3. Power supply fan; 4. Power supply power; 5. Voltage instability.

Solution from these aspects:

1. Disassemble the case and clean all the dust (especially in the north). It is best to use a waste brush to clean it, and use a vacuum cleaner to clean it more cleanly.

2. Remove the CPU fan channel fixing screws and carefully open the CPU heat sink. You will find that the silicone in the gap between the CPU and the heat sink has already dried (it has a lot to do with the high power of the CPU). Use a slightly Wet clean patch with clean dry silicone and let dry.

3. If you have the conditions, you can use high-grade silicone to make up. If you don’t have the conditions, use the following method: Squeeze a little of the purchased or white ordinary silicone onto the glass piece, and use a carbon pencil to Grind and stir on the glass until the white silicone turns light gray and becomes slightly thicker. Use a blade to apply a thin layer on the clean CPU to install the heat sink. Remember not to move the heat sink back and forth. The heat sink has good contact with the CPU. - The silicone produced by this method has little difference from Intel's special silicone after testing. It has good thermal conductivity and is not easy to dry.

4. Carefully insert the large fan, and carefully lift off the circular sticker with the trademark in the center of the fan. You can see that the central axis in the center is exposed. Use Vaseline (very cheap, available in pharmacies). Sell) Carefully apply it all over and carefully seal it with the round sticker with the trademark. - Principle: Vaseline is mostly used to smear hands to prevent dry and cracked skin in winter. It has a characteristic: when the fan is working, it will generate heat, and the Vaseline will gradually melt and penetrate into the fan bearings for lubrication. When the fan is turned off and stops working, the temperature will drop. After coming down, the Vaseline will solidify and standby. This method is more effective than adding any lubricant.

5. After installing the chassis, place slightly thicker rubber skin on the front and rear of the chassis to act as a shock absorber.

6. Try turning it on. It won’t be too obvious at first, but after using it for about a week, you will find that the noise of your computer fan and chassis is getting smaller and quieter. Basically, it is the same as the one you purchased. The time is not much different.

2) Expert analysis: The longer the computer is used, and the host is moved by some people, or the internal hard drive, fan and other components continue to run and rotate, sometimes the screws will become slightly loose, causing the vibration to intensify , the noise becomes louder. In addition, if it is used for too long, the rotating shaft of the fan will become increasingly dry, and the rotational noise will increase due to lack of lubrication.

Hurry up: Regarding this minor problem, if computer users who have not expired the warranty do not want to break the warranty seal by opening the case, they can just send the host to a repair station and let the manufacturer perform maintenance for you. If you are a computer user or the host has already expired the warranty period, then you need to open the case, tighten all the visible screws, add one or two drops of lubricating oil to the rotating shaft of the fan, and remove dust from the case by the way. Your host The noise will be reduced a lot.

3) The main sources of computer noise are as follows: Hard drive power supply fan cpu fan graphics card fan vibration of motherboard components

Sound comes from vibration, and only vibration can produce sound , the huge noise of the host when the computer starts is undoubtedly caused by the strong vibration of some internal components of the host. A big factor is that the power supply fan and CPU fan rotate when the computer starts.

There are many reasons for the harsh startup noise, but the main reasons are the following:

Vibration caused by the fan:

a, systems composed of chassis structures, power box installation structures, etc. have lower natural frequencies (that is, poor structural rigidity). When the fan is running, the speed gradually increases. When the speed is close to the natural frequency of the system, it begins to show* **Vibration phenomenon, as the fan speed increases, it gets closer and closer to the natural frequency of the system, and the vibration intensifies. When the fan speed is the same as the natural frequency of the system, the vibration is most severe. As 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. The fan blades are "eccentric": A high-quality fan has the center of gravity of the blades on the axis and runs very smoothly with very little noise. However, a low-quality fan will have a certain deviation. , the center of gravity of the fan blade does not cause "eccentricity" on the axis. When such a fan rotates, it is equivalent to an oscillator (an oscillator is an eccentric wheel added to the motor shaft). As the use time becomes longer, , the fan bearings gradually wear out, or the fan heat sink is not firmly installed or loose, etc., which will intensify the vibration and make the noise louder. It may also be due to the poor quality of the fan and poor lubrication. It spins very stiffly when it is started. When it comes to life, the lubricant inside softens and the sound becomes quieter.

c. The chassis structure is not tight: the hard disk The contact with the chassis bracket is not tight, or the steel plate of the chassis is too thin, which can easily make some annoying noises. The noise caused by the power supply fan may be caused by the loose matching between the chassis and the power supply. The rotation of the power supply fan causes the chassis to vibrate. In addition, the unstable installation of other hardware inside the chassis can 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 solidifies, and the temperature of the fan bearing is relatively high when it is first started. Low, the viscosity of the grease is large, the rotation resistance is large, and the sound is loud. After turning for a while, the temperature of the fan bearing increases, and the lubricating oil begins to take effect. At this time, the noise at startup will return to normal. This usually occurs within the first few minutes of booting up. In this case the noise will not occur in other seasons.

The fan bearing is short of oil: If the sound is loud all the time, it means that the fan needs oil. There is a circular sticker in the center of the bottom of the fan. When you peel it off, you can see the internal rotating shaft of the fan. Dip a toothpick in some sewing machine oil (about the size of a grain of rice) and add it in. Then put the sticker on. Including CPU fans, graphics card fans, and power supply fans can all be refueled. If you don’t know how to refuel, you can go to a computer repair shop and let professionals do it.

Hard drive noise: The sound of the hard drive is mainly a gurgling sound. A hard drive of poor quality will make a louder sound. Also, if the hard drive has too many fragments, it will increase the workload of the hard drive and make the sound louder. Another situation is that the hard drive has bad sectors, which will also cause the hard drive to become louder. Ordinary IDE hard drives will make a certain amount of noise during normal operation. But these sounds are small and are only produced when reading hard disk data.

Dust accumulation: A large amount of dust accumulated on the chassis, power supply, and CPU heat sink will also cause the fan sound to increase. You can try turning on the computer and using a screwdriver to slowly debug the power supply and install a few screws on the chassis. If there is any effect, check whether there is any deformation of the chassis layout. If there is any change, the source of the noise is likely to be the power supply and CPU fan.

The above reasons are all attributed to the fan, so we The following methods can be used to solve the problem:

Dedust the chassis hardware, oil the fan, and fix the internal hardware of the chassis

But pay attention to the following points:

1. Pay attention to the lubrication of the power supply and CPU fans. Some fans, due to poor quality and poor lubrication, will spin very stiffly when they are started. When they start up, the lubricating oil inside will soften and the sound will become quieter;

2. Do not move the case when running the computer. The cover of the case must be installed in place. If the seams are exposed, the case will vibrate and make loud noises when the computer is running. If the case is deformed, you can place soft objects, such as sponges and foam, under the case. and other shock-absorbing materials.

3. Do not disassemble the fan at will. You may not install it properly, which will affect the rotation and cause loud noise. If you don't understand, you can find a professional to help.

4. You should clean your host regularly, usually once a year. In areas with heavy dust, you can increase the frequency of dust removal appropriately. If you don’t have the equipment to do the dusting yourself and are worried about the trouble, it is recommended that you go to a computer repair shop to clean it.

5. Cold weather and low temperatures are a reason that cannot 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 doesn't work, you can increase the boot time in winter or simply not shut down.

6． The solution to the "eccentric" problem of the fan blade is to install the fan as firmly as possible so that it does not vibrate; another method is to inject oil into the fan bearing to buffer the vibration and thereby reduce the noise. The first two methods do not solve the actual problem; the last method is to remove the fan blade and use a thin wire to pass through the small hole in the center of the fan blade to lift the fan blade. If one end drops, it means that this end is heavier and can be ground on a grinding wheel. After a few times, use a thin wire to lift the fan blade. If the fan blade can stay still in a horizontal position, it means the modification is successful. The last one is more cumbersome. If the computer has been used for a long time and you are really unable to solve the problem, you can directly replace the fan.

The noise of the computer mainly comes from the fan. Many materials have introduced the method of filling the fan with oil to reduce the noise. However, the increased noise of the fan is not necessarily due to the lack of oil in the bearing, so a variety of factors must be considered comprehensively. situation, find out the real cause of the loud noise when your computer is turned on, and prescribe the right medicine, so that the disease can be cured.

There are usually three places for fans in the brain. One is the power supply, which has a fan inside, which can be disassembled and added with some industrial butter; the other two are CPU fans or graphics card fans, both of which can be located at the axis. Add industrial butter as a temporary solution.

Of course, this method is used when the computer has been used for a long time and a lot of dust has accumulated, causing the shaft to rotate unevenly.

The newly purchased computer is still used at home. It has been like this for a month, which means that the quality of the fan is not good. If the finance allows, it is better to replace it with a new one. In order to make it quieter, the money is still worth spending.