Why computers can't start and how to solve them

What if the computer doesn't start? Recently found that many computer users to ask this question, most of the use of computer friends should have encountered the computer can not start, and this situation is helpless. So how to solve the computer can not start this problem? There are many kinds of reasons for this. According to the symptoms of diagnosis and treatment, to understand the process of computer start-up, the fault is good judgment, the following we began to diagnose according to the fault phenomenon, first from simple to copy to exclude, first learn to observe, and then to think, this is to solve the basic principle of computer failure (how to set up startup items

Phenomenon One: The system can not start completely, can not see the power indicator light, also can't hear the sound of cooling fan. At this time, first of all to see if there is no connection, there is no power cord loose, if not the basic can be identified as a partial failure of the power supply. Check: Power cord and socket whether there is electricity, the motherboard power plug is not connected properly, UPS is the normal power supply, and then confirm the power supply is faulty, the simplest is the replacement method, but the general user home can not be equipped with power supplies and other spare parts, at this time you may try to use the following method (

First the hard drive, the CPU fan, or CDROM, and then put the ATX motherboard power plug with a wire to connect two pins (the side of the plug on its own, the upper pins from the 4th and lower pins from the left to the right number 3rd, the direction must be correct), and then the ATX Power switch Open, If the power supply fan rotates, the power supply is normal or the power supply is damaged.　　If the power supply is not a problem directly short of the power switch on the motherboard of the jumper, if normal, the chassis panel power switch is damaged. Phenomenon Two: Power indicator light, fan turn, but the monitor does not have obvious system action. This situation if the computer is used for a long time, it may be loose or too much dust, can be the memory to go out, clean up and then installed, general problems can be solved, if the new assembly on the computer should first check whether the CPU plugged in or replace the CPU, And the computer is using the situation of the CPU damage is relatively rare (except for human damage), when the damage is usually more than the smell of burnt, if you have just upgraded the BIOS or encountered CIH virus attack, this should consider the BIOS corruption problem (BIOS inexplicable damage is also some), Methods to repair the BIOS many magazines are introduced to do not repeat; To confirm that the CPU and BIOS is not a problem, it is necessary to consider the CMOS setup problem, if the CPU frequency settings are not correct will appear this fault, the solution is to remove the CMOS information, both the CMOS discharge, General Motherboard has a CMOS discharge jumper, if not found this jumper can be taken down the CMOS battery, discharge time not less than 5 minutes, and then restore the jumper original or reinstall the battery can be; BIOS and CMOS are no problem to consider the power problem: PC power supply has a special output signal, known as Powergood (PG) signal, if the low level of PG signal duration is not enough or no low level time, PC will not be able to start 2500 yuan Computer Configuration list. If the PG signal is always low, the PC system is always in the reset state. At this time the PC also appears black screen, no sound, such as the crash phenomenon. But this requires a professional maintenance tool plus some maintenance experience, therefore, the proposed substitution method; The power supply is not a problem to check whether there is a short-circuit, to ensure that the motherboard surface does not and metal (especially the installation of the chassis fixed point) contact. The motherboard and power out of the chassis, placed on the insulator surface, if it can be activated, the motherboard has a short-circuit phenomenon; If you still can't start, consider the motherboard problem, the motherboard is more complex, you can use the replacement method to confirm, and then replace the motherboard.

Phenomenon Three: Power indicator light, the system can start, but the system in the initialization of the stop, and can hear the chirping of the Beep (no video): According to the peak-Ming code can be judged the location of the fault. CCID_PAGE/AWARDBIOS1 Short Sound: The system starts normally. Indicates that there is no problem with the machine. 2 Short Sound: Description CMOS Setup error, reset incorrect option.

1 long 1 Short: Description memory or motherboard error, a memory to try.

1 Long 2 short: Indicates that there is an error in the display or display card. Check if the video card and the monitor plug are in good contact or use the replacement method to determine if the video card and monitor are damaged. 1 Long 3 short: Indicates keyboard controller error, should check the motherboard.

1 Long 9 short: Explain motherboard flashram, EPROM error or BIOS damage, replace Flashram. Repeat short ring: Indicates the motherboard power supply is problematic.

Uninterrupted long sound: Indicates that the system has detected a problem with the memory bar, reinstall the memory bar or replace the new memory bar to try again. AMIBIOS1 Short: Description memory refresh failed. Replace the memory strips.

2 Short: Description memory ECC more error. Set the memory ECC checksum option to Disabled or replace the memory in the CMOS. 3 Short: Indicates system basic memory check failed. Swap memory.

4 Short: Indicates system clock error. Replace the chip or CMOS battery. 5 Short: Indicates CPU error. Check to see if the CPU is plugged in properly. 6 Short: Indicates keyboard controller error. The motherboard should be checked.

7 Short: Description system Real mode error, can not switch to protection mode. 8 Short: Description shows memory error. There is a problem with memory, try replacing the video card. 9 Short: Description BIOS chip test and error.

1 Long 3 Short: Description memory error. Memory is damaged and replaced. 1 Long 8 Short: Description shows test error. The monitor data cable is not plugged in or the display card is not in a good cell.

The phenomenon four: The system can start, has the video, appears the malfunction prompt, then may according to the clue to judge the fault spot. The following are some common troubleshooting tips:

First, the hint "Cmosbatterystatelow"

Reason: CMOS parameters are lost, sometimes can be started, using a period of time after the crash, this phenomenon is mainly due to the lack of CMOS power supply. For different CMOS power supply methods, take different measures:

1. Welding Battery: Soldering a new battery with soldering iron; 2. button-Type battery: direct replacement; 3. Chip type: Replace this chip, preferably with the same model chip replacement.

If the replacement of the battery after a long time and the same phenomenon, it is likely that the motherboard leakage, can check the motherboard on the diode or capacitor is damaged, but also jumper use of external batteries, but these need to have a certain base of hardware maintenance to complete.

Second, the hint "cmoschecksumfailure" CMOS BIOS inspection and read error; hint "Cmossystemoptionnotset", CMOS system is not set; Prompt "Cmosdisplaytypemismatch", The setting of the display type in CMOS is inconsistent with the actual measurement; prompts "Cmosmemorysizemismatch", the main memory on the motherboard is not the same as that set in CMOS; prompts "Cmostime&datenotset", the time and date in CMOS are not set. All of these need to be reset to the CMOS.

Third, prompted the "Keyboardinterfaceerror" after the crash reason: the motherboard on the keyboard interface can not be used, unplug the keyboard, reinsert after the normal boot system, the use of a period of time after the keyboard unresponsive, this phenomenon is mainly a number of times to unplug the keyboard to cause the motherboard keyboard interface loose, Remove the motherboard with a soldering iron can be, or a live unplugged keyboard, causing the motherboard on a security block (marked on the motherboard for FN), replaced by a 1 ohms/0.5 watts of resistance can be.

Iv. self-test process interrupted at Xxxkcache This indicates that the cache on the motherboard is damaged and can be excluded by setting the "Externalcache" item to "Disable" in the CMOS settings. Similarly, when a self-test board part is interrupted, the part can be considered damaged, and the solution can generally be shielded in CMOS, and if it is not possible to block the part, it is best to replace the motherboard.

Well, about the computer can not start how to do, the computer can not start the cause of the analysis and solutions for you to introduce here, according to the steps given above one by one to eliminate, generally can find causes the computer cannot start the problem. Only determine which part of the computer is not the normal start, we can be targeted to understand, judge, solve, if there are questions, welcome to discuss with us.