Common causes and solutions for computer boot and no response

Common causes and solutions for computer boot and no response

Failure phenomenon One: Turn on the power, press the boot button, the computer without any movement.

Analysis: At this time the power supply should be to the motherboard and the hardware power supply, there is no movement to explain that the power supply part of the problem. (including the motherboard power portion)

Inspection ideas and methods:

1, the mains power supply problem, please check the power outlet is normal, the power cord is normal.

2, chassis power problems, please check whether there are 5 volts standby voltage, the motherboard and power supply between the connection is loose, if not measuring voltage can find a power exchange to try.

3, the motherboard problem, if the above two are not a problem, then the possibility of the motherboard failure is relatively large. First check the motherboard and the power-on button line is loose, the switch is normal. You can put the switch on the wire for a short try. If not, only replace a motherboard to try. (Note: You should try to find the same model or the same chipset board, because other motherboards may not support your CPU and memory)

Failure phenomenon Two: Press the boot button, fan rotation, but no image of the monitor, the computer can not enter the normal working state.

Analysis: Fan rotation shows that the power supply has started, the monitor has no image, the computer can not enter the normal working state that the computer did not pass the system self-test, motherboard BIOS settings have not yet been output to the display, the failure should be in the motherboard, video card and memory. However, sometimes bad power and display damage can cause this failure.

Inspection ideas and methods:

1, if there is alarm sound, indicating the problem of self-test. The beep is set by the BIOS on the motherboard. There are two types of bios, namely AMI and award. Most motherboards are BIOS with award.

The BIOS for award is set to:

The long sound keeps ringing: the memory strips are not plugged in tightly.

One short: The system starts normally.

Two short: CMOS setup error, need to reset.

One long short: memory or motherboard error.

One long two short: monitor or video card error.

One long three short: keyboard controller error.

One length nine short: the motherboard BIOS flash RAM or EPROM error.

The BIOS for the AMI is set to:

One short: Memory refresh failure.

Two short: Memory ECC checksum error.

Three short: System basic memory check failed.

Four short: System clock error.

Five short: CPU error.

Six short: Keyboard controller error.

Seven short: System real mode error.

Eight short: Memory error displayed.

Nine short: BIOS chip inspection error.

One long three short: memory error.

One long eight short: the Monitor data cable or video card is not plugged in well.

2, if there is no alarm sound, may be the horn is broken, please follow the following steps.

A, check the memory, the memory will be removed with the eraser to wipe the pins, change the slot to insert the actual test machine. If there are more than two memory sharing, please use only one memory test machine.

B, check the video card, check whether the card is plugged in, remove the pins with the eraser after the installation in place after the test machine. Then unplug the video card from the monitor and try again to see if you want to enter the next self-test. If possible replace a video card to try.

C, check the motherboard, first remove the motherboard on an insulating plane (such as books or glass), because there is a time box deformation will cause the motherboard slot and board contact bad. Check whether there are foreign bodies in each slot of the motherboard, there is no oxidation discoloration of the teeth, if you find that one or two of the teeth and other teeth in the same color, it must be caused by oxidation or dust, please use a knife to scrape the surface of the teeth, and then insert the card after the test machine. Then check to see if the connection between the motherboard and the button is normal, especially the hot Start button. Finally, use the discharge method to reset the BIOS to try. The method is to take down the button battery on the motherboard, wait five minutes to install it, or put the battery back on for two seconds before reloading it, and then try to see if it is normal. If you have a condition to replace a motherboard try.

D, check the CPU, if the CPU overclocking caused by the fault, then the BIOS reset above should be resolved this problem, if not overclocking so check the fan is normal, it is not a good replacement CPU try.

E, the power is not good will also appear this phenomenon, conditional replacement power to try.

F, if the above-said method can not solve the problem, please remove the CPU, motherboard, power, memory, graphics and other hardware all unplug, and then the test machine to see whether normal. If normal, after troubleshooting the power supply and motherboard problems, use the following symptom four method to resolve. If the test machine is not normal, then these components

Try each replacement.

Failure phenomenon Three: After the boot, the monitor does not have the image, but the machine reads the hard drive, through the sound judgment, the machine has entered the operating system.

Analysis: This phenomenon indicates that the host is normal, the problem is on the monitor and the video card.

Check the idea and method: Check the monitor and video card connection is normal, the connector is normal. If necessary, replace the video card and monitor to try.

Symptom four: After the boot has shown the video card and motherboard information, but the self-test process to a certain hardware stop.

Analysis: Display motherboard and video card information indicating that internal self-test has passed, motherboard, CPU, memory, video card, monitor should have been normal (but the motherboard BIOS is improperly set, poor memory quality, power instability will also cause this phenomenon). The problem is more likely to be the other hardware. (in general, the hardware is bad, the BIOS self-test is just not found, but can also do the next step self-test, if it is because of hardware reasons to stop self-test, indicating that the fault is more serious, the hardware circuit may be a problem).

Inspection ideas and methods:

1, to solve the motherboard BIOS setup improperly can be used to discharge the method, or into the BIOS modification, or reset to the factory settings (check the motherboard manual will find steps). With regard to modification, it is important to note that in the BIOS setup, the keyboard and mouse alarm entries are set to stop the self-test if it fails, so the keyboard and mouse will appear.

2, if you can read the self-test process, so generally speaking, the BIOS self-test to a certain hardware, then the possibility of failure of the hardware is very large, you can unplug the power cord and signal cable of this hardware, boot to see if you can enter the next self-test, if you can, then this is the hardware problem.

3, if you do not understand the self-test process, please drive, hard drive, optical drive power cord and signal line all unplug, the sound card, modem, Nic and other cards all unplug (graphics memory except). The printer, scanner, and other external devices are all disconnected, and then press the hard drive, floppy drive, CD-ROM, card, the order of the outside equipment reinstall, install a hardware on the boot test, when a hardware problem, it can be judged that it caused the fault.

Symptom Five: Pass self-test, but cannot enter the operating system.

Analysis: This phenomenon indicates that the boot file is not found, if not the hard drive out of the problem is the operating system is broken.

Inspection ideas and methods:

1, check whether the system self-test to find the hard drive, such as do not understand the self-test can be used to retry the boot disk, put in a light dispatch boot CD or boot floppy disk, the BIOS settings for the optical drive (floppy) boot. After reboot into a disk, enter "C:" Enter

2, if you can enter the C disk, indicating operating system problems. Reinstall the operating system;

3, if can not enter the C disk, indicating the hard disk or partition table damage. Use the zoning software to determine whether the partition can be partitioned, if the partition can not indicate that the hard drive is broken, otherwise the partition table is damaged. Repartition can resolve the failure.

Failure Phenomenon Six: Enter the operating system soon after the crash.

Analysis: After entering the operating system there are many reasons for the crash, here only to discuss hardware issues, from the hardware considerations. The problem should be in the memory, power, CPU, and the various hardware of the cooling aspects.

Inspection ideas and methods:

1, open the chassis, observe the graphics card, the CPU power supply fans are normal rotation, the heatsink is more dust, whether the chassis is dirty (if cleaning dust must be a power outage). Hand touch hard drive is hotter, normal state than hand micro heat. If it's hot, you can determine if there is a problem with the hard drive.

2, such as CPU overclocking, blame on frequency use.

3, the power supply, memory and motherboard quality is not caused by the fault can only be determined by the replacement after the test machine.

When the system is turned on, the fan has turned on the light is also lit is the display screen does not show the display of the lights are still the same as not boot as a flash of how to do

Unplug all the lines that are plugged into the back of the mainframe.

Press the boot button 15, this is to host static electricity, sometimes the weather changes will have static electricity caused this problem.

Plug those threads back in the way they used to, turn them on and see if they're normal, and then look down.

Then start with the hardware:

1 Unplug the Power,

2 Unpacking the chassis,

3 RAM and card pressed on the motherboard

4 Take a look at the motherboard capacitance is not the phenomenon of slurry--if any, will be sent to repair

5 boot look, if normal, use it! It's not normal.