What do I Consider When Buying a Refurbished Laptop?

Assembly computer is also called compatible machine or DIY computer. That is, according to personal needs, select compatible accessories required by the computer, and then assemble various non-conflicting accessories together to become an assembled computer.

Assembly computer is also called compatible machine or DIY computer.

That is, according to personal needs, select the accessories required by the computer, and then assemble various non-conflicting accessories together to become an assembled computer. Computer accessories generally include: CPU, motherboard, memory, graphics card, hard drive, optical drive, monitor,

Before you start to assemble the computer, you should first learn the basics of the computer, including hardware structure, daily maintenance knowledge, common fault handling, operating system and common software installation.

Preparation before installation

Install the machine according to your own needs, do not blindly compare performance levels, buy accessories according to actual needs.

For example, when choosing a case, pay attention to the rationalization of the internal structure to facilitate installation, and secondly, pay attention to the beauty and color to match other accessories. Generally, it is better to choose a vertical chassis, rather than a deprecated horizontal chassis, especially the power supply in the chassis. It is related to the stable operation of the entire computer. Its output power should not be less than 300W. Some processors require 400W. The power supply should be selected as needed.

In addition to the power supply of the chassis, other required accessories generally include the motherboard, CPU, memory, graphics card, sound card (some sounds are already integrated in the motherboard, which is called the so-called integrated sound card), hard disk, and optical drive (with VCD and DVD drives) , Floppy drive (currently rarely used), data lines, signal lines, etc.

In addition to the machine accessories, tools such as screwdrivers, needle-nose pliers, and tweezers need to be prepared.

In addition, prepare the power plug indoors before installation.

Basic installation steps

When assembling a computer, generally follow these steps:

(1) The installation of the chassis is mainly to unpack the chassis and install the power supply in the chassis.

(2)

First of all, pay attention to quality

Otherwise, when I buy a love machine to go home, there is always a problem. It is a pity to waste a few hundred yuan to replace the accessories. Therefore, when choosing to assemble a computer, the quality must not be ambiguous. How to ensure quality? It starts with two aspects, one is the brand, and the other is the genuine product. Everyone knows that shoes like Nike, Anta, Li Ning are better, as is the assembly of a computer. Use brand accessories, this cannot be vague. With a brand, you must also ensure that the brand is genuine. There is no big difference between a fake brand and a non-brand. Non-brand accessories cannot be compared with brand accessories in terms of workmanship and materials.

Followed by after sales service and guarantee

Only with good guarantees can you buy with confidence, otherwise it will be very troublesome. Generally, those who have a three-guarantee service commitment are indicated, and those who have a three-guarantee service are indicated. When there is a problem and a complaint is made, the chance of winning the lawsuit is greater. When buying online, it depends on whether the store has joined the Taobao protection plan, merchant reputation and evaluation. The Taobao protection plan is specially designed to protect the interests of buyers. When joining, sellers must apply for a certain amount of funds to be frozen (such as 2,000 yuan, different stores with different main products, the amount of frozen gold is different, and the digital category is 2,000 yuan). Damaged, the money will be directly deducted after the appeal is successful. The types of protection include truthful description, seven-day return, genuine guarantee, etc. It is safer to join the guarantee. In addition, it depends on the reputation and evaluation of the merchants. High reputation and good evaluation generally refer to integrity, but those with low reputation are not necessarily bad. Pay attention to screening.

Choose the right configuration to truly suit yourself

Selection of configuration mainly depends on parameters. General buyers do not need to be very professional. Just look at the main parameters (expect a few more), mainly CPU frequency, memory capacity, hard disk capacity, display size, keys Mouse brand, discrete graphics. For example, the CPU looks at the main frequency (the current mainstream CPUs are usually above GHz, 1GHz = 1000MHz, the larger the value, the faster the computer usually is. The CPU frequency can be checked by right-clicking on my computer / properties. If you are interested, you can try a bit). The most important factor is the capacity of the hard disk. Generally, about 500G is enough for home machines. However, the current price of hard disks is not much different. If you use 1TB (1TB = 1000GB), you are not afraid of it being full. It is psychologically balanced. Look at the cache. The speed of moving files with large caches will be faster. The speed of desktop computers is at least 7200 rpm, and generally do not need to consider. If you choose a solid-state drive, pay attention to the life of the hard drive and the number of reads and writes. The memory capacity is generally 2-4GB (for home use). If you need to play large games, you need to increase the memory module to 8G. The speed below 2GB is too slow, and it is easy to play. There is no special requirement. A 19-inch widescreen (1440 * 900 pixels, 18.5 inches is almost the same) display is more suitable. It is too small to look inconvenient for the eyes; if it is too large, it will feel oppressive. Often you have to type or play keyboard games, it is best to have a good feel and good quality keyboard, but if there is no need in this regard, the gift keyboard is enough. Friends who want to play large games or have entertainment need a computer with an independent graphics card (both AMD APU series and Intel Core series CPUs have a core graphics card). Otherwise, the game will be stuck when the game is played. The most important thing for a graphics card is the display chip memory, also known as video memory. Generally, the larger the video memory capacity, the better the display effect. In addition, gamers can also choose a gamepad. Optical drives generally have two types: recordable and non-recordable. Burning refers to using a CD-ROM to burn a disc. If you want to burn, you also need to buy a special empty disc. If you don't need to burn, a general DVD-ROM or the like can be used.

The price cannot be ignored, of course

In terms of price, don't be greedy for cheap, assembling a computer with an extremely low price. Its parts and components are likely to be of low quality or even fake. The high-profile assembly computer is of course relatively easy to use, but the price is also more expensive, and it will become ordinary with the replacement of accessories in a few years, so it depends on your needs, too low to use, too high will Waste, just fit.

According to your own needs, it is best to choose the suitable price configuration.

First, the type of home audio and video, you can choose the AMDAPU series CPU, configuration price control around 2500 is a good choice.

Second, the type of home entertainment, the same choice of AMDAPU series CPU is no problem, add an independent graphics card ATI entry, and control the price of 3000-3200 yuan on it.

Third, low-end game types, at this time choose Intel Core I5K series CPU with a NVIDIA GTX750TI independent graphics card, the price is about 3800 yuan.

Fourth, mid-end game types, you can choose Intel Core I5-I7K series CPU, with an NVIDIA GTX660 or 760 graphics card, the price is around 4500-5000 yuan.

Fifth, high-end game types, choose Intel Core I7K series CPU, with an NVIDIA GTX790 graphics card, the price is about 6,500 yuan.

Note: The K series are all overclockable CPUs. If you do nt need to overclock, you can buy a CPU without K. If the funds are limited, you can buy a loose CPU on Taobao. You can choose to buy Intel Xeon E3 series CPU with high cost performance.

Mid-range configuration:
CPU: Intel Xeon quad-core E3-1230V3 1395.00 (fragment price)

Motherboard:

MSI B85-E45 413.00

heat sink:

Kyushu Aeolus (DEEPCOOL) Black Ice 400 99.90

Graphics:

Dataland HD7850 Cool + 2G DC (Bai Cool) 899.00

RAM:

ADATA Games Weilong DDR3 1600 8G (4G × 2) 519.00

Mechanical Hard Disk (HDD):

Western Digital (WD) blue disk 1TB SATA6Gb / s 7200 to 64M 349.00

power supply:

Huntkey jumper450B 269.00

Assembling a computer system is roughly divided into four steps

Step 1. Make a bootable USB flash drive

Step 2.U disk boot

Step three: partition the hard disk

Step four: install the system on the computer

(For detailed steps, please see the reference.) ^[1-2]

1. If there is no sound, perform the following steps in order: (1) Check if there is any problem with the power supply, etc. (2) Whether the power switch pins on the motherboard are connected correctly. The position of the power switch pin is generally on the outermost side, but the position of the power pin of some motherboards is more special. Be careful not to insert it incorrectly. (3) The memory is generally a place prone to failure when installed. Especially for low-end motherboards, poor contact often occurs due to the quality of the connectors. First see if the memory is tight. The motherboard memory slot may be damaged. Try another slot. In addition, good motherboards are generally very compatible, and integrated boards, especially sleeves, are particularly picky about memory. Of course, the easiest way is to try another memory. (4) Whether the CPU is in good contact. Special attention should be paid to the motherboard of the Sotl slot. Some motherboard slots are quite tight, and you must use force to complete the insertion. To check whether the gold finger of the CPU is exposed, the original slolt CPU should pay special attention to this, because the package of slotl is easy to block the sight, and carelessness may mistakenly think that it is completely inserted. If you use a 370-based CPU, you must pay attention to whether the CPU is completely flat. You must press the four corners of the CPU firmly with your fingers, and then release the lever. (5) If it still does not work, then change the power supply. If your motherboard is an integrated board, the issue of power supply should be given priority. In other words, the integrated board is especially "picking" the power supply. If you encounter such a problem, you can try another brand-name power supply. ^[3]

If you still can't solve the problem after the above steps, you have to find a dealer. After the minimum system test is successful, the motherboard and other components can be installed in the chassis. ^[3]

2. If the minimum system is normal, but there is no response after all the connections are made, it may be: (l) The hard disk cable is reversed. Remember that the first hard disk cable (the red line) is always close to the power cable. (2) The power of the power supply is insufficient. You can try to unplug the optical drive, but you can't unplug the hard disk. If it is normal, the power of the power supply is too small. (3) The memory module is loose again. (4) Other uncommon conditions: The bolts of the inferior chassis are too tight, which may cause the motherboard to distort, or a local short circuit. Solution: loosen the bolts or replace the case, and temporarily place a piece of plastic foam on the place where the motherboard may be in contact with the case wall. ^[3]

3. If the computer responds, the fan runs normally, but the display has no signal: (l) Check if the graphics card is plugged in. The AGP slot of some motherboards is relatively loose. If you encounter a thin board graphics card, it is easy to have poor contact. It is recommended that you prepare a PCI graphics card when installing and try it out. However, some motherboards have a B-type 0S chip in front of the PCI slot, so that the PCI graphics card protruding from the bottom of some boards cannot be inserted in place, and it is necessary to change a slot. Also, if you use an integrated motherboard, and you want to connect an external graphics card, there may be restrictions on the type of graphics card. For example, the motherboard of S 5730 requires a graphics card with TNT or higher. (2) Whether the monitor video cable is connected properly. ^[3]

4. After the installation, the test passed. The next step is to set up the hard disk, and then start the CD-ROM, partition ... What might happen here?

(1) The hard disk cannot be found: Listen to the sound to determine if the hard disk is running, otherwise there may be a problem with the power supply. Check whether the data cable is connected well. If you use the same data cable to connect the hard disk and the optical drive, the length of the cable may be very tight. Check whether the hard disk jumper is set correctly and whether it conflicts with the optical drive. Whether the hard disk settings of COMS are correct. For example: The MODE parameter of the hard disk is generally set to `AuTo or `LBA instead of `Norma one. I still can't find it, so I have to go to the dealer. ^[3]

(2) Optical drive problem: It is clear that the optical drive is rotating, but it is not reading the disk. What's wrong? First check whether the jumper is correct. If you use a data cable alone, you must jump to "MASTER". ^[3]

(3) Floppy drive problem: The floppy drive light is on but the disk is not read. This may be the floppy drive cable is reversed. Installing the data cable of a floppy drive is not as simple as connecting a hard disk cable. The floppy drive wiring depends on the specific model. Note that there is a ', 1 ` or at the pin of the data cable on the floppy drive. Align the red side of the data cable here. Always prompt that the floppy disk is not formatted. This is the disc is not in place. Causes of head misalignment. The method is to readjust the front and rear positions of the floppy drive so that the disk is in place, and some cases are easy to deform. In addition, the material of the floppy drive is very thin, and the floppy drive will deform. The floppy drive cannot be used for booting, but the disk can be read. This is likely to be a refurbished floppy drive. However, since floppy disks have basically been eliminated, this problem rarely occurs. ^[3]

The other problems are software problems, so I won't go into details here. Finally, I will mention two other matters needing attention: one is the problem of static electricity. Summer is usually no problem, but in winter, especially in winter in the north, the climate is dry, you must pay attention to it. When static electricity accumulates to a certain degree, it is easy to cause damage to hardware. Therefore, before touching key components such as memory modules, you should first touch the case with your hand to eliminate static electricity. The second is that the memory module must be inserted firmly. The clips on both sides must be completely locked, otherwise the memory or even the motherboard may be burned out, especially after bumps during handling, you should check it before starting. ^[3]