Precautions for purchasing second-hand notebooks:

Step 1: Observe the shell of the notebook.

Check the appearance carefully to see if it has been disassembled or cracked. If you find this kind of problem, don't buy it at any price. But if it's just some minor scratches, it can also be considered, because for the sake of maneuverability, some small friction is inevitable. And buying a second-hand notebook computer depends on the thickness, size and weight, compared with similar second-hand notebooks. Who chooses depends on his actual needs.

Step 2: Observe and check your LCD screen carefully.

This is very important. As we all know, LCD screen is the most expensive part of notebook computer accessories, accounting for 20%~35% of the whole machine cost. Therefore, we should pay special attention to: 1, whether the screen is damaged, because the machine with traces will be used for a long time, and the refraction of light will seriously damage people's vision. It is not cost-effective to accidentally move back to the machine that affects vision. 2. Carefully observe the size and display effect of the display screen, and consider the display effect and size of the display screen in combination with the price. Of course, it can also be used to reduce the price. 3. Identify the color of the display screen in detail. In addition to observing whether the screen is sixteen-color, 256-color or sixteen-bit true color and 24-bit true color, we should also observe it obliquely from top to bottom, left and right. If you can accurately see any color on the screen, you can judge that it is true color. Otherwise, if the color can only be recognized by observing it directly, it is pseudo color. You can hold a high-priced and high-quality LCD monitor in the business office and put it next to the notebook you want to buy. Under the same interface, compare their brightness, contrast, reaction speed, visibility and other parameters. 4. Pay attention to the delay performance and brightness of the display. When choosing a liquid crystal display, the most important thing is its delay length. If the delay is too long, your eyes will feel very tired. At the same time, brightness is a weakness of LCD. Generally, the brightness of popular LCD is 200cd/㎡ (lumen), and displays below this brightness are not desirable. Also, when looking at brightness, don't just look at brightness, but look at it with contrast adjustment. Some liquid crystal displays have the same brightness no matter how they are adjusted. As a result, when the contrast is improved, it looks dazzling and uncomfortable. In short, the eyes look comfortable and beautiful. 5. Pay attention to the bad points of the LCD screen. The most common ones are white spots and black spots. When you buy it, you can use the following simple methods to identify it: the general method of identifying black spots is to turn the whole screen background into a white screen, so that black spots can't escape your eyes; White dots are just the opposite. Turn the screen background to black, and then the white dots will show their true colors! However, in addition to white and black dots, there are sometimes dots of other colors. At this time, consumers can establish a red, yellow and blue screen background for simple identification.

Step 3: Carefully identify and test the components of the notebook.

Carefully check the CPU, hard disk, memory and other components of the notebook computer. When buying, you'd better take apart the machine and see for yourself. In addition, we must be alert to the despicable practice of profiteers using second-hand notebooks to replace notebook CPU with desktop CPU. Because the CPU with the same frequency will not be noticed by ordinary users, but the CPU using desktop and notebook is completely different. Due to the problem of different calorific value, the heat emitted by CPU cannot be emitted in the notebook, which leads to the instability of the system. Therefore, in the process of purchasing, it is required to conduct on-site inspection of CPU as much as possible. As for the hard disk, because we can't know the advantages and disadvantages of the hard disk by visual inspection, we can only detect it by software. The detection software can be DM, Norton, etc. After scanning with DM and Norton, DM takes a long time and Norton takes a short time. The scanning process must be smooth and consistent. If any cluster takes too long, there must be something wrong. As for memory, the memory of second-hand notebooks ranges from 32M to 256M. Try to choose a memory larger than 64M, preferably above 128M. Memory is replenished when purchasing, because some laptops have special memory, which has been discontinued and cannot be replaced. In addition, other built-in devices, such as video cards and sound cards, should also be checked face to face.

Step 4: Check the interface of the second-hand notebook computer.

Because it is very necessary to have a complete interface. In today's notebook computers, with the popularization and application of external storage devices, USB interface has become a necessary device for desktop and notebook computers, and USB interface is a very important interface. Therefore, it is best to buy a second-hand laptop with USB interface. In addition, the infrared transceiver function is also an indispensable function of the notebook now. Moreover, when buying a second-hand notebook, an important purchase condition is to look at its internal power supply. External power supply is necessary, and it is absolutely impossible without battery, so the power supply mainly depends on the quality of the battery, that is, the service life of the battery. Second-hand goods, Ni-MH batteries usually last for one hour or two, and lithium-ion batteries can last for two hours. This is the most basic requirement, otherwise it will not be considered.

Step 5: Check the status of peripheral devices.

Check whether the keyboard, mouse, CD-ROM drive, floppy drive and modem are available and easy to use. Last time I saw the keyboard of a second-hand notebook in the second-hand market, it was shiny and badly worn. In that case, I don't need to buy it. It costs hundreds of dollars to change a keyboard. At the same time, open a word processing software to see whether each key on the keyboard is available and whether the mouse is flexible. Whether there is a built-in floppy drive, CD-ROM drive, modem, etc. Both, please try them one by one, as long as the equipment in the computer can't be missed!

Step 6: Strive for the after-sales service of second-hand merchants.

This should also be the last step. Remember to take back all accessories (battery, power cord, etc.). ) drivers for this notebook, such as video card, sound card and communication card, are also needed, but most manufacturers say they don't have them. It doesn't matter without a driver. You can download a complete set of device drivers for notebook computers from their websites. Finally, second-hand notebook computers usually have a warranty period of two or three months, so the dealer must write the warranty period on the invoice, and during this period, conduct several tests on your second-hand notebook to find out all hidden problems. Otherwise, after the warranty period, you will be in trouble if you want to repair this kind of computer, especially the hardware part, and you must consider whether it is convenient to repair it in the future. If you can't buy accessories, you can't take them even if the machine is cheap, because the internal space of the notebook computer is small and there is a shortage of parts.

In the current notebook market, second-hand notebooks also account for a considerable proportion. After all, second-hand is much cheaper, if it is for machine configuration.

If the requirements are not very high, then a PII-class notebook between 5000 and 7000 yuan is definitely suitable for you. When buying a second-hand notebook,

It is best to find some large businesses specializing in second-hand notebook business, rather than looking for some small shops, and some buy regular notebooks.

Our shopping mall will also engage in the sales of some second-hand notebooks. The second-hand notebooks they provide are usually of good quality and will also provide certain warranty service.

The configuration is also relatively high, but the price may be a little more expensive. It is also a good choice to buy second-hand notebooks through them.

Because the quality of second-hand notebooks is uneven, the price is often opaque and there is a lot of bargaining space. At this time, you might as well run more.

Know the approximate price first, and then bargain according to the quality and color of the machine when buying. Second-hand notebooks are very profitable.

Be hard when bargaining. As for how much you can cut, it depends on your own ability. The warranty service for second-hand notebooks is usually

Very limited, and some don't even have it. In the inspection, in addition to the above points, we should also pay attention to the settings of the drive and machine.

Most of the second-hand notebooks we often see now are smuggled from abroad, that is to say, they are similar to * * * *, but they are driven and

The machine settings may be somewhat incompatible with the Chinese operating system environment we use, which should be paid special attention to.

In addition, it takes more time and energy to choose a second-hand notebook. Be careful everywhere, don't wait until you buy it home to regret it.

Where can I buy second-hand machines?

At present, the places where second-hand laptops are sold are mainly concentrated in some second-hand local markets or online shopping malls. Here is a brief introduction to the differences between the two stores and the matters that should be paid attention to when buying second-hand notebooks.

● It is convenient and quick to buy second-hand machines online!

It is not uncommon to buy products online now. As early as three or five years ago, online consumption has become a fashion. The simple and quick way to buy makes many young people "crazy". Nowadays, more and more online shopping malls are coming one after another, and their advertisements can be seen everywhere in TV, radio and magazines. It is no exaggeration to describe them with overwhelming words.

Compared with the past, the online shopping mall now has a wide variety of goods, from needles, threads, brains and daily necessities to cars and airplanes. You can buy your favorite goods without leaving home. Of course, in addition to the dazzling array of goods, the online mall is also a "second-hand transaction" section, where you can put the items you want to sell online, price them yourself and sell them.

The "second-hand trading" section is often the holy land of Taobao, just like an online "second-hand market". Of course, among these second-hand products, there are some second-hand laptops. These second-hand books are mainly products of some internationally renowned brands such as IBM, Toshiba, Sony and Hewlett-Packard. Of course, there are also some classic machines. Although it was made a few years ago, it doesn't look very old now because of its excellent workmanship. In addition, retro is also popular now. The old one looks cool, too.

Although there are many good things, consumers should pay attention to the following items when choosing products online, so that you can buy your favorite products better and more safely.

1. Try to make purchases in the same city or cash on delivery, and don't easily remit the payment to a bank account in another place or someone else. It is always right to pay with one hand and deliver with the other.

Be sure to check carefully after you get the goods. In addition to routine inspections such as hard disk and keyboard, it is also necessary to pay special attention to how long the battery of the notebook can last and see if the battery has been removed. A durable battery is very important for a notebook, otherwise it will become a mobile PC.

3. No matter whether the seller is a unit or an individual, you must agree with him on the warranty issue. If it is licensed, don't forget to ask for an invoice. It is best to discuss the replacement period with the seller for a certain period of time.

If you want to buy second-hand notebooks online, it is recommended to go to some large online shopping malls, such as Yi Bei and Taobao.

At present, some shopping malls have introduced corresponding protection measures specifically for online transactions. For example, Taobao's "Alipay" service is a secure payment service launched by Alipay specifically for online transactions. The essence of its operation is to take Alipay as a credit intermediary and provide value-added services for buyers and sellers to temporarily keep the payment for goods before the buyer confirms the receipt of the goods.

● Second-hand notebook store

Nowadays, most people who buy second-hand machines still like to transfer them in the store themselves. After all, consumers can only see the real machine in the store. It is much more real to experience the product personally than to see the pictures on the Internet, and at the same time, they can learn more about the product. Especially for second-hand notebooks, no matter whether they are old or new, whether the shell is obviously scratched or damaged. After seeing it with your own eyes, it is still very reassuring.

The most important thing to buy second-hand notebooks in the market is never to buy second-hand notebooks in informal places. Friends who often come to Zhongguancun know that there are often vendors selling second-hand goods on the roadside or on the overpass. They usually gather around passers-by and sell you some cheap second-hand goods. Some people who are greedy for cheap buy them as soon as their hearts soften, but when they get home, they will find that these bought things are basically fakes and inferior products. Moreover, most of these items come in through illegal channels, and there is no quality guarantee at all. When consumers buy this kind of thing, it is equivalent to taking money and throwing it away.

At the same time, some unscrupulous traders will also replace the internal parts of second-hand machines privately to deceive consumers. Or through software, modify the hardware configuration of the notebook and replace an outdated product with a new product with mainstream configuration, and ordinary consumers may be deceived. Therefore, consumers should still go to some local large-scale second-hand shops to buy.

Notebooks have always been favored by people because of their small size and portability. Although the price of notebook computers has dropped a lot, it is still relatively expensive, and many friends with limited budgets have turned their attention to the second-hand notebook market. However, because the origin of second-hand notebook computers is complex, the old and new colors are different, and there is no lack of boasting from the merchants selling notebooks, so choosing second-hand notebook computers has become a big problem. Here, the author briefly introduces some matters needing attention in selecting second-hand notebooks, hoping to help you choose and buy.

Pay attention to battery life.

Battery is the life source of notebook computer, and it is also one of the fastest aging accessories in notebook computer. At present, most second-hand notebooks on the market are products that have been used for two to three years, while an ordinary lithium battery will age more or less after two to three years, and some of them have a battery life of only 1 hour. Some businesses will replace the batteries before selling second-hand notebooks. On the surface, it seems to prolong the battery life, but this is an undesirable behavior. Because the internal structure and circuit of notebook battery pack are complex, the battery pack with battery cells replaced is more prone to failure, and the battery performance will drop sharply after a few days of use, which may even damage the notebook body, so it is not recommended to buy a notebook with battery cells replaced.

Of course, if you buy a laptop that is used regularly and can be connected to the power supply, the battery problem becomes less important. Batteries that can stand by for more than an hour can be used as UPS power supply.

Screen fulcrum can't be ignored.

In addition to tablet computers, almost every notebook computer has this screen hinge, and the hinge is also a mechanical part that will wear out every time the notebook computer is used, so the wear of the screen hinge is also an important issue in the purchase of second-hand notebooks. If the hinge is too loose, the notebook will be awkward to use.

The tightness of the shaft can't be hidden, and consumers can see it directly, but JS, which sells notebooks, usually adds an excuse that "it can be tightened if it is loose" to deceive consumers. Some laptops can be adjusted by adjusting screws if the screen axis is loose, but most laptops can't adjust the screen axis. When the damping material in the middle of important official is worn, only the whole shaft can be replaced. Even those notebooks that can be adjusted, because the damping material has worn out, it won't be long before it becomes loose again. Imagine what it would be like if the screen of the notebook suddenly fell off during use.

Bright spots, bad spots and dark spots on the screen

Most consumers are familiar with the bright and bad points of LCD, but not everyone knows the black spots on the screen. Black spots are more hidden than bright spots and bad spots, which also affects normal use. Dark classes are as big as soybeans and as big as thumbs. Dark classes are different from bright spots and dark spots. Dark classes are only slightly darker in local color, which can't be observed without paying attention to light colors, and can't be detected by changing to dark colors. There are two main reasons for the formation of the dark class. First, it is caused by external pressure. Such black spots are small in area, dark in the middle and relatively normal in the outer layer, which are more common in thin and light notebooks. Another kind of black spot is caused by the aging of LCD screen, which has a large area and may continue to deteriorate. Because the dark spots are only slightly darker than the surroundings, they are easily hidden by specially designed desktops. Therefore, when choosing a notebook, you can find bright spots, color cast and other problems by changing several background testing machines or using professional testing software, such as Noika Ntest.

In addition, the decline of LCD brightness is also a common problem of second-hand notebook computers. If it is not obvious, it is generally inevitable and acceptable, but if the LCD panel is obviously yellow, it is best not to buy it.

Pay attention to peripherals and interfaces.

The peripherals and interfaces of second-hand notebooks are also areas with very high failure rate, such as keyboard failure or poor interface contact. These peripheral interfaces are very important, but many consumers ignore these problems when checking the machine. Among many interfaces, USB interface, audio interface and network interface are the most commonly used, especially USB interface is more important. The common problem of USB interface is that the interface has no voltage. In this case, devices without power such as mouse and USB flash drive cannot be used normally, while devices with power such as printers and scanners can be used normally. Therefore, I suggest that you can bring a USB flash drive or mouse when checking the USB interface. Other interfaces, such as network card, modem, speaker, serial port, parallel port, PCMCIA, MIC interface, infrared data association, etc., are better to try.

Keyboard and mouse are the most important input devices in computers, and they are also used the most frequently. Most notebook keyboards are designed with special 83 or 86 keys. When buying, be sure to try whether each key is sensitive and comfortable, whether the key position is still elastic and whether the handwriting is clear. Keyboard failure is actually a very serious problem. Although not every key on the keyboard is commonly used, they are indispensable. When you find that a key is broken, the merchant may tell you that it is an "unremarkable" key, just replace it with a new one. But often not, one key may lead to the need to replace the whole keyboard, and replacing the keyboard of a notebook usually costs hundreds of dollars, which is not worth it. In addition, because most people use an external mouse when using a notebook, it feels that the touchpad of the notebook becomes dispensable. Actually, it is not. Imagine how you need to live when you forget to bring your mouse.

Internal injuries are more important.

Beware of CPU overclocking. The processor is always the core equipment in the computer, so we must pay enough attention to it when purchasing notebooks. After choosing a brand and model of second-hand notebook, it is best to check the standard configuration on the Internet, pay attention to the frequency of CPU, or use some occupancy testing software to test it. The performance of CPU is directly related to the performance of the whole machine. In order to meet the demand of second-hand notebook for a certain period of time, it is recommended to choose a machine with close factory time and high frequency when purchasing, because the processor of notebook computer is generally not upgradeable.

Be careful of the bad hard disk. The hard disk itself is a relatively fragile device, and it is also one of the vulnerable parts of the notebook. Hard disk with bad track is quite unfavorable to the overall stability of the machine. If the hard disk still has abnormal sound or the speed drops sharply during use, you should be vigilant. The hard disks used by many second-hand notebook computers in the market are relatively old, generally 4200 rpm, 5 12KB cache hard disks or even older models, and the capacity is mostly below 20G. If you are satisfied with all aspects of the machine except the hard disk, you can consider changing to a new hard disk. After all, the data stored in the hard disk is very important during the use of the notebook.

Memory capacity cannot be too small. Memory capacity directly affects the whole machine performance. At present, the memory capacity of second-hand notebooks on the market is between 32MB and 128MB, and a few of them are below 32MB. When purchasing, try to choose a product with a capacity greater than 64MB, preferably 128MB or more, and perhaps it is more appropriate to upgrade to 256MB by yourself. When purchasing, you need to pay attention to what memory the notebook uses and whether there is a matching model to upgrade.

Warranty issues also need attention.

The biggest drawback of second-hand laptops may be the warranty. Although some second-hand notebook businesses can also provide some after-sales service, the limitations of this after-sales service are too small, and the time is often very short, usually only a short month. And basically most second-hand notebooks have no after-sales service. The notebook is broken, so you have to bear the maintenance cost yourself. However, because it is a common situation, I can only suggest that you try to choose a merchant with a relatively large scale, more machines and complete accessories. Such businesses often have a good reputation and are more convenient to maintain.

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Although second-hand notebooks are relatively cheap and cost-effective, you should consider your own motives and purposes when buying them. Some people just want to play games, while others just process some files and surf the Internet. Except for some things like advertising design or video editing, which have higher requirements for notebook computers, ordinary configuration can basically meet the requirements. So when buying, you must choose according to your own needs. For example, if you want to type, it is enough to spend more than two thousand yuan on a second-hand notebook. In short, for the purchase of second-hand notebooks, we need to rationally analyze our own needs, dare to accept our own shortcomings, and dare to face the failure after purchase.