What if the computer turns on and doesn't respond?

computer boot did not respond to the main table in the boot computer monitor without any graphics card, and even the case of the chassis power LED is not bright, the following for you to introduce the computer boot no response solution.

The most common computer boot, no way to eliminate the method

Computer boot does not respond to the most common are: computer host power cord is not connected, monitor switch is not turned on, monitor power supply or monitor data line bad contact.

When the computer turns on and it doesn't respond, we need to first observe the computer press the Power-on key, the computer's power LED is on, when the power LED is not lit, it is likely that there is a problem with the power supply, you can see the main power cord and external power supply is connected, whether there is a line fault, etc. When the computer power is bad also will appear computer boot no response, these need to do some simple exclusion to confirm. When the computer indicator light, the computer internal CPU fan normal turn, then generally can be initially judged as a power supply is not a big problem, we go to check the monitor, see the monitor power supply LED is on, the monitor data cable is connected well. Also observe whether the computer keyboard and mouse LEDs are lit, generally if the host is no problem, the computer keyboard lights and mouse indicators are normal, this situation often occurs in the monitor, such as the display switch did not open, the monitor data cable is not good, or the monitor power supply failure.

The above computer boot no response, we have a simple investigation can not find the problem, recommend the use of substitution, such as the problem of suspected display, you can take a good try, the problem is still, the data line also to try, if still not, then the problem is likely to appear in the host, in short, can be excluded as far as possible, This is more and more easy to find the problem, the General monitor troubleshooting method is relatively simple, here is not too much introduced, the following focus on the host failure caused by the computer boot did not respond.

Computer failure caused the computer to boot no response

Computer boot no display of troubleshooting methods. (No alarm sound)

The 1th step: first check the computer's external wiring is connected, the various lines plug again to see if the fault is excluded.

2nd step: If the fault is still, then open the mainframe box to see if there is any excess metal in the chassis, or the motherboard deformation caused by the short-circuit, smell the chassis has no burnt paste flavor, the motherboard has no burned chips, the CPU around the capacitor is damaged.

3rd step: If not, then clean the motherboard dust, and then check the computer is normal.

The 4th step: If the fault is still, then unplug the motherboard on the reset line and other switches, led lines, and then use a screwdriver short-circuit switch, see whether can boot.

5th: If you can not boot, and then use the minimum system method, the hard drive, floppy drive, optical drive data cable unplug, and then check whether the computer can boot, if the computer monitor appears on the screen, then the problem in these several devices. Then one by one the above several devices into the computer, when the access to a certain device, the failure to reproduce, indicating that the fault is caused by this equipment, and finally focus on the inspection of this equipment.

6th step: If the fault is still, the failure may be caused by memory, video card, CPU, motherboard and other devices. Then use the interpolation method, the Exchange method and other methods to check the memory, graphics, CPU and other devices are normal, if there are damaged equipment, replacement of damaged equipment.

7th step: If the memory, graphics, CPU and other devices are normal, and then the BIOS discharge, using isolation method, the motherboard is placed outside the chassis, the memory, graphics, CPU, etc. for testing, if the computer can be shown, and then the motherboard installed in the chassis test until the cause of the failure found. If the failure is still required to return to the manufacturer to repair the motherboard.

8th step: The computer boot without display but there is alarm sound, when the computer boot up, the system BIOS began to post (Power-on self-test), when the computer detected a fatal error in a device, then control the speaker issued a sound report error. Therefore, there may be no power on the display of alarm sound failure. For computer boot without the alarm sound failure can be based on the meaning of the BIOS alarm, to check the failure of the equipment to troubleshoot.

No display on the boot (divided into the monitor completely does not display and emits the alarm sound) The monitor does not display completely:

1, power supply has no work

To determine if the power supply is available at work check three places:

(1), whether the cooling fan on the back of the power supply does not turn. Description: If the power supply is broken, its cooling fan will not turn, but also may happen to be the fan itself is broken, it should also check other places to determine whether the power is broken.

(2), the power led on the computer's host panel is not lit. Instructions: The computer host on the LED indicator, indicating power, hard disk, floppy disk remote work, if these LEDs do not light, it is likely that the power supply is not.

(3), at startup, do not hear the floppy drive, hard drive or CD-ROM sound at work. Note: When starting the computer will check these hardware devices, if they do not hear the sound, indicating that the power supply did not supply them at all.

If the power supply is not working, do not think that the power supply is broken, you can check the following several places:

<1>, the total switch whether to skip the electricity, the plug is loose, if you use an extension cord, you should check the extension cord fuse is burnt.

<2>, power supply is due to short circuit and stop power: Because the power supply itself designed to detect short-circuit function, so it will detect the output of the circuit has a short-circuit, cut off all the power supply, it caused the power does not work. This condition can be seen by the cooling fan's operation, if the power supply is good, and the host inside a short circuit phenomenon, then when the power is turned on, you will find the fan turned to stop, and issued the voice of the AIDS, if the switch off after a while, the fan turned a few laps, this symptom is a typical short-circuit phenomenon. To find the components that cause a short-circuit, remove all DC output connectors from the power supply, if all the connectors have been unplugged, the phenomenon of short circuit disappears, it represents a component of the circuit is short-circuit, can plug the connector back, until the short-circuit phenomenon occurs again, you can confirm that the component is broken, You can replace the component. Be aware that the power needs to be turned off before unplugging and inserting connectors to avoid burning parts of the computer.

<3>, DC output of the power supply is normal: if the above three points mentioned the situation has been checked, the power supply is still not working, at this time can be used to measure the power of three meters DC output, if there is no output, the power itself is broken, replace a power supply, should be able to solve the problem

2, the power supply is normal but still silent no shadow

(1), the problem of the monitor itself

If the power supply is normal, and the start of the host Panel on a variety of LED lights, especially the hard drive lights are flashing a flash in the work, indicating that the computer has a normal start, but the monitor does not show, also did not hear the sound of the horn, at this time, please check the Monitor power switch is open, This is to see if the power led on the monitor is on, if it is not lit, it may be the power cable of the monitor is not connected, or the monitor power switch is not open at all. If the indicator light is bright, please check the brightness and contrast of the display is not tuned, some of the brightness of the display if it is tuned to the lowest, it will all black, at this time the monitor is not fully displayed. If the problem persists, you can borrow a good monitor to determine if the Jiao monitor is broken.

(2), the problem of CPU

If the power supply is not a problem and the monitor itself is good, but still no shadow, it may be CPU problems, this includes the CPU is not plugged (SOCKET 7 CPU First foot direction is not correct or the CPU is not fully plugged in), overclocking super too fierce, the frequency is too high, so that the CPU is not running at all, CPU core voltage adjustment out of range, if the above problems are handled, or the same can not start, by the CPU itself may be broken, a CPU to try.

(3), other

If the previous three inspection is finished, still can not find the problem. Most likely the connection to the hard drive is reversed. Note that one side of the red core should be closest to the power connector. may also be the video card, memory and motherboard contact is bad, will also cause no display on the boot.

If the above steps can not eliminate the fault, then the computer may have hardware failures, the majority of the motherboard fault, recommended to take to professional maintenance site maintenance.

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