开机后显示屏不亮的原因和解决办法

开机后显示屏不亮的原因和解决办法 The reason why the screen is not bright after startup and the solution At present, there are two main reasons causing the computer black screen, a hardware failure, two is a software conflict, the distinction between the two lies in the location of occurrence of black, black is in the boot, or in the machine after the startup, the black screen appears in the use process. Of course, whether it is hardware failure, or software problems, in a sense, are not isolated, try to follow the following ideas to solve, I believe the black screen will soon be properly resolved. Black mishap When the "black screen" suddenly appears after the boot, please pay attention to the sound of the PC loudspeaker in the computer. If the PC horn sends out an alarm, then we can initially determine the hardware part of the problem, depending on the length of the sound. For example, if the PC horn is four long and short when the computer is switched on, then it is easy to determine the problem on the display card based on this prompt. If so, the reader can open the case and see if his display card is securely inserted. If you feel a little loose, please pull out the display card, then insert it again, tighten it, then screw it. If you remove the plug problem, the card slot is also relatively strong, you can pull out the display card, and then change the motherboard on another slot try. If the user does not belong to PCI graphics card in the AGP slot but the new board, the computer motherboard and only one AGP AGP slot slot, you can find another one and then try the motherboard, troubleshooting the physical aspects of the display card. If the card insertion is relatively tight, and also eliminates the physical aspects of the failure, there is another possibility is to display the card itself "gold finger" in the normal contact problems. If this is the case, the display card to pull out, and then find a clean rubber in "Goldfinger" back rub, because of bad contact problem of this kind of "Goldfinger" is mostly due to its stained with some dirty things. If the computer boot PC speaker alarm is not a long four short, but short is a rapid, at the same time the situation is black, so according to the phenomenon we can identify the memory your computer has problems in contact. Poor contact solutions and display cards are basically the same, that is, pull them out, and then re insert, pay attention to the plug must be inserted in the end, and the memory slot on both sides of the clip firmly. Some SDRAM slot on the motherboard more trouble, because of the production of the slot on the motherboard are very tight, if users encounter this kind of situation do not make strong use of hard, you can use your fingers holding the bottom board SDRAM slots, and then use the thumb pressed down hard into the memory, listening to a sound micro memory that has bottom finally, memory can be fixed by clips. There are some black screen phenomenon, the computer will not call the police, then the simplest is to be based on the mathematical "exclusion method" to specific problems specific analysis. Check that the power panel is out of order, remove the necessary components of the computer and switch on some other equipment that can be used to check whether the power panel is working properly. If the power panel is not fault, Then check the connection between the computer power and the main board according to the normal procedure. That is to say, check the power supply of the main board. If the plug is not connected wrong, you should check whether the power burned, and if the power burned, the fan will stop. Some of the early computer chassis power supply will often appear for shortage, if you suspect that belong to this problem, please put all the user power line CD-ROM, hard disk, floppy drive is pulled out, and then restart the computer, greatly reduce the power consumption rate, see this situation is to solve. If the problem is still not resolved, please remove the motherboard BIOS CIH virus accidental damage, if the motherboard is bad or short-circuit welding head. In addition to the above, as the main frequency of CPU continues to increase, the role of power supply in the whole PC power system is also becoming more and more important. Some people describe CPU as the heart of a computer. For a long time, we are too concerned about whether the heart is healthy and powerful, but ignore the power supply that provides the power and energy for the heart. Due to the power shortage, the computer may lead to a black screen phenomenon. The symptom is that after the power on, you can hear the case power, fan start normal, and did not hear the system reported "drops" sound, but the machine does not work, there is no boot self-test process, the screen black screen. If the power supply is plugged in, the boards and memory are re inserted and all boards or components are not loosened. Most of them are caused by insufficient power supply. The construction of a strong, love machine for your health, do not ignore the purchase of computer chassis and power supply, buy a rated power of 250 watts or more is a love of your machine. There is a need to explain, currently on the market a lot of marked rated at 250W power actually did not reach a requirement, which also leads us to another suggestion in the buying power to take care of famous brand, the brand is a powerful guarantee to your machine safety at this time. If you have more peripherals installed on your machine, such as dual hard disks, dual CPU, dual drive, SCSI cards, or whatever, you'd better find a larger power (300~400 watts) or server power. As for those users who P4, Thunderbird, GeForce3 must use the power of 300 watts or more, otherwise, black is more trouble than it will emerge in an endless stream. Black screen soft bad Of course, caused by the phenomenon of black majority is because PC mishap in trouble, but it is not absolutely, soft hurt sometimes may be more prone to blind users. In the process we are using the computer, some of the blank screen may be entered into the soft fault WINDOWS 98/WINME/WIN2000 WINXP system even after the (but I haven't found a black screen, WINDOWS XP but it is not conclusive, we do think it has it). If the user found that after the machine assembly is complete, the installation of operating systems and other software problems, always appear inexplicable problems, or even suddenly appear black screen crash. Here we need to rule out the cause of the virus, because the system runs because of the virus caused by black screen, although a lot of, but the solution is unique, that is, kill the virus, There's nothing more to say. On the contrary, we should pay more attention to the error or blank screen in the operation of the program. The most obvious here is the program failure due to hardware drive problems. This problem occurs frequently in some 3D accelerated graphics card, sound card, PCI card, SCSI card, RAID card and three party card, and most of these problems, the most obvious way is in the application program, game software in the running process of frequent crashes due to a black screen. For instance in the play "dungeon keeper" II, S3 DIAMOND VIPER 770/GEFORCE 2PRO accelerated graphics card will often be shut out of the game (display card does not recognize), even the game will give up and use the software hardware acceleration effect. Analysis of the causes of this problem is mainly due to the non mainstream 3D game source program written in standard 3D acceleration chip or ignore the more high-end, the accelerated updating of chip power, so the game itself in the hardware support do not ideal, also affected the play of the product. Another example is the PCI card, PCI card etc. due to the conflict driver and system application, resulting in suddenly black screen or restart the machine in operation, encounter this kind of problem can be resolved by readers of the updated version of the driver installation. "Computer black screen" software and hardware solution to the problem For some older or assembled computers, black screen is a relatively easy problem. There are many reasons for the computer to appear black screen. For example, the monitor is damaged, the video card is damaged and the graphics card is not contacted well. To eliminate black screen failure, we should adopt the method of combination of elimination and replacement. The basic principle is to replace the most suspicious computer components, and the following steps can be used to analyze the cause of the failure. Hardware section Check whether the computer components are securely inserted First, check that the monitor cable is secure, insert it into the host interface, and then check if the contact between the video card and the motherboard I/O slot is good. If necessary, please remove the video card, re install once, ensure that the security plug in place, good contact. Two, confirm that the monitor is damaged If the monitor and the video card are fixed, please try changing the monitor to confirm the normal. If the screen is no longer black, then the reason is that the monitor may be damaged. Three. Make sure the fan is out of order If the monitor is not damaged, check that the CPU fan is running further. Such as operation, multimeter can be used to measure voltage, the output is normal for + 12V and + 15V, if not normal, you can change a power supply to try. Four, detect CPU, graphics cards and memory If there is still a black screen, you can remove all the components except CPU, graphics card and memory, and then start the computer with power on. If there is a memory failure, there should be an alarm. If it is not memory, change a normal CPU and restart the test. If there is still a black screen, you can only change a motherboard, the problem should also appear on the motherboard. In addition to the hardware side of the cause of black screen phenomenon, there are three aspects of the "soft" reasons may lead to "black screen."". Software chapter First, the hardware acceleration settings too high Hardware acceleration can make software that handles large amounts of graphics run more smoothly, but can lead to "black screen" if computer hardware is accelerated too high. In order to solve the "black screen" fault, please first try to slow down hardware acceleration. 1, click the Windows start menu, click control panel, and then double-click show". 2, select the troubleshooter tab, and in the "hardware acceleration", the slider from the "whole" gradually drag to close to "no" position. 3 Click the OK button. Two, disable 3D to speed up or upgrade video card drivers If Windows has been configured for 3D acceleration, but the video card does not support the function, then when running a game or multimedia program, there may be "black screen" fault. 1 click start, then click Run, then type dxdiag in the open box, and press enter. 2, select the display tab, and under the DirectX function, click the test Direct 3D button to get the correct Direct 3D function. 3, if a rotating cube does not appear on the screen, it indicates that the video card does not support 3D acceleration. At this point, disable the function by clicking the "disable" button after "Direct 3D acceleration". If your graphics card does not support 3D acceleration, in addition to disabling this feature, you can also contact the graphics manufacturer to update the driver so that it supports DirectX's 3D acceleration. Three, graphics card driver and graphics card is not compatible The DirectX installer may incorrectly check the video card and install a driver that does not drive properly. Make sure the video card driver is correct. 1, click start, and then click control panel, and then double-click the system". 2, select the hardware tab, click the "device manager" button, then click "show card" or "display adapter" before "+", and then right-click the display adapter, and then click "properties" button. 3, select the driver tab, click the driver details button to display the video card driver used. If the driver is not compatible with the use of the card, then you are in the "driver" tab, click the "update driver" button and follow the onscreen instructions to install the graphics driver version. OK, through the introduction of the soft and hard Dafa, we can basically deal with most of the black screen, and if one day everyone's machine has suffered, you might as well give it a try. Computer crash of the 4 main reasons (there is a black screen solution) In the computer fault phenomenon, the crash is a common fault, but also difficult to find one of the reasons for the failure. According to the computer crash occurs, can be divided into four categories: The crash appears in the starting process: when the computer is started, only to hear the sound of the hard disk self but can not see the screen display, or simply in the post chirp but the computer does not work, or errors in the post; When a computer operating system is started, a crash occurs: the screen shows that the computer has checked through itself, but when the computer is loaded into the operating system, the computer crashes; In the use of some applications in the process of crashes: the computer has been running well, only in the implementation of certain applications when the crash occurred; When exiting the operating system, there is a crash: a crash occurs when you exit Win98 or other systems or return to the DOS state. The system can not be diagnosed by software or tools from the "dry" state, thus increasing the difficulty of troubleshooting. The general performance of the crash is: the system can not start, show black screen, show "solidification", keyboard can not input, software operation is not normal interrupt. There are probably thousands of reasons for the crash, but only two aspects: first, computer hardware, two is software design is incomplete, or with the system and other systems running program conflict. In the hardware aspect, culprit is recently in the clock frequency of popular computer industry "DIY" - let CPU overclocking work outside the rated operating frequency, the CPU in excess working state, the crash is not surprising; the second reason is a hardware overheating, or hardware resource conflicts. Of course, there are other hardware reasons. In software, the crash caused by software accounts for almost the majority of computers (except for overclocking computers). In the Windows9x series, the 16 bit and 32 bit hybrid kernel mode is used, so security is low and crashes due to program memory conflicts are frequent. Here is to introduce the breakdown of the general treatment after the failure of the inspection method. 5, eliminate the system "false" crash phenomenon. First of all, the power supply problems caused by the "false" crash phenomenon. Check the computer power supply is plugged in, if the power socket contact is good, the host, display and printer, scanner, external MODEM equipment, power plug speakers and other main external power supply is * into whether the power switch power socket, the components in the open state (ON). Secondly, check the data between the components of the computer, control whether the connection is correct and *, whether the plug is loose. In particular, the host and display data line connection is bad, often lead to "black screen" false crash phenomenon. 6, eliminate viral infection caused by the crash phenomenon. With non-toxic clean system disk boot system, and then run KILL, AV95, SCAN and other anti-virus software of the latest version of the hard disk inspection, to ensure that computer security, to eliminate the virus caused by the crash. In addition, if the cause of the phenomenon of death in antivirus, this is mostly because the virus destroys the system files, applications and key data files, or anti-virus software in the elimination of virus at the same time the normal file for misoperation, destroy the normal structure of file. When you encounter such a problem, you can only reinstall the system or software that has been damaged (that is, when the operation is causing crashes). 7, software installation and configuration problems caused by the crash phenomenon analysis and elimination. First, if software crashes during software installation, there may be some software conflicts between the system configuration and the installation. These configurations include the system BIOS settings, and CONFIG. Settings for SYS and AUTOEXEC.BAT, settings for WIN.INI, SYSTEM.INI, and settings for some hardware drivers and memory resident programs. You can try modifying the settings above. The BIOS can select the default settings, such as "LOAD SETUP DEFAULT" and "LOAD BIOS DEFAULT"; CONFIG.SYS and AUTOEXEC.BAT can F5 at startup or skip the system configuration files according to F8 gradually choose to perform and one by one to modify the CONFIG.SYS and AUTOEXEC.BAT configuration (especially the configuration on the EMS and XMS EMM386) to judge the conflict with the local hardware setup program and memory resident program what, some hardware drivers can avoid conflict by loading the same. Second, if a crash occurs after the software installation, the installed program conflicts with the system. The general practice is to restore the configuration of the system before installation, and then analyze the resources and possible conflicts in the newly installed part of the installer, and gradually troubleshoot the cause. Deleting a new installer is also one way to resolve conflicts. 8, the system starts the process of crash phenomenon to analyze. Crashes during system startup include two scenarios: One is fatal crash, that is, the system self-test process is not completed on the crash, the general system does not give tips. For this reason, we can make a further analysis of the cause of the fault according to the list of fatal errors in the self test when combined with other methods. Two is non fatal crashes, in the process of self-examination or self-test completed after the crash, but the system gives voice, text and other prompt information. According to the non fatal error code table and the post whistle sound corresponding to the error code table to check post; post column error code in the table of the corresponding sound whistle is focus on examination of the possible failure of components, but also can not be ignored for inspection of related components, because many the fault is not by the message that part of the direct cause, and often by the relevant parts caused by the fault. 9, because of the use and maintenance caused by the crash phenomenon analysis and elimination. After using a computer for a period of time, it may cause crashes because of improper use and maintenance, especially after a long time without using the computer. The causes are as follows: First, dust causes the system to crash: dust is the enemy of computers. Excessive dust attached to the surface of the CPU, chip, and fan causes poor heat dissipation of these components, and dust on the circuit board often causes short circuits in wet conditions. All two scenarios lead to a crash. The specific processing method can be used brush to dust, or swab with anhydrous alcohol cleaning dust components. Be careful not to brush and cotton wool and cotton on the circuit boards and components to become a new crash source. Two, parts damp: long time no use of computer, will cause some components damp and not normal use. The hair dryer can be used as a low heat barrier for drying". Be careful not to heat a part of the component for too long or too high temperature to avoid baking the broken elements. Three is the board, chip pin oxidation lead to poor contact: the board, chip out, Wipe the pin surface with an eraser and remove the oxide and plug it into the socket. Four is the card, peripheral interface loose lead to crash: check carefully each I/O slot plug is correct, each peripheral interface contact is good, the cable connection is normal. 10, because of the system configuration caused by the crash phenomenon analysis. System configuration and computer hardware, equipment and systems, BIOS, motherboard jumper switch settings are closely related, common cause of the crash failure: (1) the main frequency settings are improper: such failures mainly include the CPU main frequency jumper switch setting error, the CPU settings caused by the Remark BIOS and the actual situation does not match, overclocking use CPU, or CPU performance bad crash. (2) memory parameter settings are improper: such failures are mainly memory set errors and Remark memory caused by the BIOS settings, inconsistent with the actual situation. (3) CACHE parameter setting is improper: this kind of fault mainly has CHCHE setting error, and the BIOS setting caused by RemarkCACHE is inconsistent with the actual situation. (4) the CMOS parameter is destroyed: frequently modifying the CMOS parameter or the damage of the virus to the CMOS parameter often results in confusion of the CMOS parameter and is difficult to recover. You can use the method of CMOS discharge and reset the CMOS parameter with the default settings of the system BIOS. The discharge method of CMOS can be carried out according to the main board instruction. If it is caused by a virus infection, after resetting the CMOS parameter, you must also antivirus the hard disk. 11, hardware installation caused by the crash phenomenon and ruled out. The negligence in the installation of hardware peripherals often leads to inexplicable crashes, and this phenomenon often appears gradually after the computer has been used for a period of time, so it has a certain degree of confusion. (1) components are installed in place, plug connection loosening, caused by incorrect crash, display card and I/0 slots often cause poor contact failure in the show, such as "black", memory, CACHE and slot plug loose often caused the program to run in the crash, even the system cannot be started, and other card slot (the contact socket) problems are often caused by the phenomenon of death. To eliminate these failures, simply install the appropriate boards and chips by hand or unplug them from the slot (socket). If an idle slot (socket) is available, the part can be replaced with a slot (socket) to fit the contact problem. Cable connection is not correct, sometimes also cause crash failure. (2) due to improper installation parts deformation, damage due to the crash caliber is not correct, often leads to inappropriate length of the screw component mounting hole damage, screw contact to the internal circuit components caused by short circuit installation step does not lead to crashes, specifications board, non-standard parts or the often cause variation of chassis, the motherboard, the shape of the board so the internal components lead to extrusion parts to crash damage rather baffling local short circuit, internal components. If only the appearance of the computer parts is deformed, it can be solved by the correct installation method and the replacement of the parts conforming to the specifications. If the internal components have been damaged, the new parts can only be replaced. 12, hardware quality problems caused by crashes phenomenon analysis and elimination. Generally speaking, computer products are produced by large international manufacturers in accordance with international standards, The rate of defective parts is very low. But the lure of high profits to many illegal manufacturers of computer parts, change, re labeling make only superficial changes (Remark), nor even scrap and defective products sold as genuine, resulting in the performance of these super level play is not stable, the environment is slightly unwell or use for a long time will occur frequently. In particular, CPU, memory, motherboards and other core components and related products of poor quality, is the main cause of no cause of crashes. The following components shall be examined with great emphasis: (1) CPU. CPU is the most counterfeit and vulnerable to crash. By Remark CPU in low temperature and short time use all normal, but as long as the continuous high temperature environment for a long time use, the breakdown of its vulnerability is very easy to expose. The use of Windows, 3DS and other features of the higher requirements of CPU software, DOS software than CPU can find more problems. If it is necessary to confirm whether this is the cause of this failure, refer to the instruction manual for the CPU master frequency jump of 1 to 2 grades, for example, reduce 166 to 150, 133 or 120. If the crash phenomenon substantially reduced or disappeared, you can judge that there is a problem with CPU. You can also change the normal CPU of the same model with the exchange method. If you don't crash any more, you can conclude that it is a CPU problem. Some users like to use CPU overclocking for high-speed performance, which is often the cause of computer crashes. General CPU will jump back to the original frequency can solve the halting problem. (2) memory bar. Memory is often done by hands and feet: speed tags are changed, such as: 70ns is Remark for 60ns, non parity check parity memory, non EDO memory posing as EDO memory, bad memory bar posing as good memory. In BIOS, the memory read and write time is increased appropriately (e.g. from 60ns to 70ns), and if the crash disappears, the memory speed problem can be determined. If the quality of memory itself, only the replacement of new memory can be resolved.