For the unpacking machine, the waiter will generally explain: "Although this machine has been opened, there is no quality problem. The customer opened it and said no ... "and so on. I'm not here to incite people not to believe what the waiter said. It is true that some unpacked machines have no quality problems and are not returned. But who can guarantee that every unpacked machine will be all right? What's worse is to buy a notebook that costs only a few thousand dollars, so don't consider disassembling it.
Also, be sure to read the seal carefully and open it yourself (this is your right). Some merchants put another layer on the original seal with transparent tape to hide the traces of being opened. You really can't tell if you don't look carefully. It's almost like a brand-new package.
After opening the seal and outer packaging, don't take out the contents in a hurry, first look at whether the packaging foam is complete and damaged. The original packaging foam is intact. Next, find the product packaging list, carefully check the random items on the list, and then check one by one, check the notebook, power adapter, related accessories, product manual, warranty certificate (with the same number as the notebook), warranty certificate record card, etc. In addition, the system installation disk, recovery disk (some models are not equipped), drive disk, etc. Provided randomly by the manufacturer. If you are sure there are many, you can test the machine.
It is very important to check whether the model of the machine is consistent with the model to be purchased, and then check the serial number, especially for users who buy foreign brands. If the serial numbers are inconsistent, it may be parallel imports or assemblers. However, if the domestic notebooks are inconsistent, unpacked or replaced, there may be quality problems or rework machines. Check whether the serial number has been changed or re-pasted. Some machines can enter the motherboard BIOS and check whether the serial number in the BIOS is consistent with the serial number of the body. If the last digit of the product model ends in C, it means China. You can enjoy a three-year global warranty. In order to ensure the reliability of product quality, it is best to check online or call 800 toll-free number.
After checking the serial number, you can check the appearance. Check the shell for scratches and paint loss first, and then look at the shaft for cracks or looseness. Check carefully whether there are scratches on the LCD screen without turning it on, because this is related to the visual effect. Then check whether the keyboard is flat. Finally, check the battery to see if the color of the battery is brand new. In addition to visual inspection, special software is needed for testing.
After completing the above inspection, it is confirmed that there is no problem, and then the power-on detection can be carried out. These tests need some test software, so you can save these software on a USB flash drive before buying. When testing, insert the U disk into the USB interface to check whether the interface is intact and whether the computer can start the U disk. Insert the U disk into each USB interface one by one to see if the system can read the data inside and work normally. Then take out the U disk, insert the SD card into the corresponding slot, and check whether it can be started. After the above inspection, you can check the audio output and input interfaces, and bring headphones and microphones when checking; S-terminal, 1394 interface, VGA and other interfaces can be checked with corresponding connecting wires.
After starting the machine, carefully check whether the LCD screen has any bad points, which can be checked by the Chinese version of Nokia Monitor Test 2.0. After the operation, white, red, green, blue and black will be given in turn to test the screen. Through this test, we can find out whether there are any bad spots on the LCD screen. Be careful when checking, especially the small white highlights are very difficult to detect. In addition to detecting bad spots, the software can also detect important display effects and technical parameters, such as brightness, contrast, color purity, focus, ripple, jitter and readability of the display. There is also a software called DisplayX- display screen test wizard 1. 1, which is also very good. You can also test whether there is a bad spot on the LCD screen, and you can also test the breathing effect and the 256-level gray scale (the better the LCD screen is, the more obvious the 256-level gray scale is). The biggest feature of DisplayX- display screen test wizard 1. 1 is that it can indirectly test the delay time, and find a piece without smear from the mobile box, and its corresponding time is the delay time of LCD screen.
CPU is one of the core components of a computer, and it is also a component that must be tested. The most common CPU detection tool is the Chinese version of Cpu-Z 1.54. The CPU types it supports are quite comprehensive, and the startup speed and detection speed of the software are very fast. In addition, it can also detect the related information of motherboard and memory, including the commonly used dual-channel and three-channel detection functions of memory. Of course, it is best to use original software and Intel processor identification program for CPU identification. This software can test CPU frequency, system bus, cache, supported technologies, CPUID data, etc. It is the authoritative software for testing Intel processors.
In addition to the above tests, the chipset should also be tested. The chipset identification utility 2.9 of Intel series chips is recommended here. This software is the authoritative software for Intel chipset testing. You can directly and quickly know the specific model of Intel chips used in the current motherboard. Including chipset name, northbridge chip (memory control chip) (memory controller) name, southbridge chip (input/output control chip) (I/O controller) name and integrated display chip (interconnected graphics) name. This tool supports Intel's full range of chipsets.
Chinese version of Cpu-Z 1.54 can also be used for memory detection, which can detect the capacity, frequency and timing of memory. Here, it is recommended that the Chinese version of Everest Home Version Beta 2.20.475 detect the memory. It is powerful and can display every aspect of PC information in detail. Support thousands of motherboards (3400+), hundreds of graphics cards (360+), detect PNP devices such as parallel port/serial port /USB, and detect various processors. The new version adds the function of viewing remote system information and management, and the results are exported as HTML and XML. Use it to detect memory, the information is very detailed, and even the production date can be detected.
The graphics card can also detect and display chip frequency, video memory frequency, video memory bit width and other items through the Chinese version of Everest Home Edition Beta 2.20.475, which is very comprehensive. In addition to the above hardware specifications, the detection of graphics cards can also be carried out with the famous 3DMark 2006 1. 1.0, and the stability of the whole system can also be detected. If the whole test can't run, there is a problem with the compatibility or stability of the machine. After installing 3DMark 2006 1. 1.0, click benchmark. After the test is completed, 3DMark 2006 1. 1.0 will grade the graphics card. Users can check online in advance whether this score matches the graphics card. If you test with a battery, the test score will be much lower than normal.
Hard disk can be detected by the green Chinese version of HDtune v2.52 Its main functions include hard disk transmission rate detection, health status detection, temperature detection and disk surface scanning. In addition, it can also detect the hard disk model, firmware version, serial number, capacity, cache size, transmission mode, hard disk temperature and so on. , and can also carry out "benchmark check" and the current Ultra DMA mode. Although these functions are also available in other software, it is commendable that this software integrates all these functions, and it is very small and fast. More importantly, it is free software. The only drawback of this software is that it can't detect the speed of hard disk, so it can be made up by the Chinese version of the aforementioned Everest home version Beta 2.20.475. Everestpro software can detect many parameters of hard disk, which is of little significance to ordinary consumers.
The detection of optical drive can be carried out with Nero InfoTool 5.3.3.0, which can not only detect the model, cache size, reading and writing speed of optical drive, but also detect the formats supported by optical drive reading and writing.
The battery is directly related to the use time of the notebook, so in addition to observing whether the appearance is brand-new, special software must be used for testing. For example, IBM and Sony are all equipped with special software to detect the battery charging times, while HP can detect the battery charging times in the BIOS. After these software or BIOS tests, if it is found that the battery has been charged for more than 3 times, it means that the battery has been used, and the user can ask the dealer to replace it. As for other brands that can't detect the battery charging times, the total running time (theoretical value) of the battery can be detected by Passmark Battery 2.1build1004, and the battery charge and remaining service time can be detected. I would like to remind you that the charge of the new battery should be within 3%. After the test is completed, click "Battery Information" in "Information" to test the specific information of the battery. Pay attention to check whether the data in the columns of "design capacity" and "full capacity" are consistent, because the design capacity and full capacity of a new battery should be exactly the same.
After the above comparison, it is suggested to use PCMark04 Patch 1.30 to conduct a comprehensive test on CPU, memory, graphics card, hard disk and system. Easy to use and professional, more suitable for PC users who have just started. The higher the score, the better the system performance. This test can give the stability of the notebook and the comprehensive performance of the main accessories. The free version of PCMark04 Patch 1.30 can only run the system test group and display comprehensive results. Registered users can run CPU test group, memory test group, graphics chip test group and hard disk test group, and can display individual test results.
After completing the above work, if all the indicators can pass, you can buy with confidence. Finally, don't forget to check the gifts provided by the merchants.
And your price range, I'll recommend some for you.