Solution of desktop power failure

Display the information of the motherboard and graphics card, indicating that the internal self-check has passed, and the motherboard, CPU, memory, graphics card and monitor should all be normal (but improper BIOS setting of the motherboard, poor memory quality and unstable power supply can also cause this phenomenon). The problem lies in the possibility of other hardware. The following is my collection of solutions for desktop power failure, welcome to read.

Desktop power failed to start. Solution 1:

Fault phenomenon 1: After the power is turned on and the power button is pressed, the computer does not move.

Analysis: At this time, the power supply should supply power to the motherboard and hardware. Nothing indicates that there is something wrong with the power supply. (Including motherboard power supply part)

Inspection ideas and methods:

1, mains supply problem, please check whether the power socket is normal and the power cord is normal.

2. If there is a problem with the power supply of the chassis, please check whether there is a standby voltage of 5 volts and whether the connection between the motherboard and the power supply is loose. If the voltage cannot be measured, you can find a power supply to change it.

3, the motherboard problem, if the above two are no problem, then the possibility of motherboard failure is relatively large. First check whether the connection between the motherboard and the power-on key is loose and whether the switch is normal. You can try to short-circuit the switch with wires. If not, we have to try to change the motherboard.

(Note: Try to find a motherboard with the same model or chipset, because other motherboards may not support your CPU and memory. )

Fault phenomenon 2: Press the power-on key, the fan rotates, but there is no image on the display screen, and the computer cannot enter the normal working state.

Analysis: The rotation of the fan indicates that the power supply has been started, the monitor has no image, and the computer cannot enter the normal working state, indicating that the computer failed the system self-test and the BIOS settings of the motherboard were not output to the monitor. The fault should be in the motherboard, graphics card and memory. But sometimes poor power supply and monitor damage can also lead to this failure.

Desktop power can't be started: check ideas and methods 1

1. If there is an alarm sound, there is something wrong with the self-inspection. The alarm sound is set by the BIOS on the motherboard. There are two kinds of BIOS, AMI and AWARD. Most motherboards use bonus BIOS.

The BIOS setting of the award is:

The long tone keeps ringing: the memory stick is not inserted tightly.

One short: the system starts normally.

Disadvantage 2: CMOS settings are wrong and need to be reset.

One long and one short: memory or motherboard error.

One long and two short: there is something wrong with the monitor or graphics card.

One long and three short: keyboard controller error.

One long and nine short: FLASH RAM or EPROM error in motherboard BIOS.

The BIOS of AMI is set to:

One short: Memory refresh failed.

Two shortcomings: memory ECC check error.

Three short: the system basic memory check failed.

Four Shorts: System clock error.

Five short: CPU error.

Six short: keyboard controller error.

Disadvantage 7: System real mode error.

Eight short: display memory error.

Nine short: BIOS chip check error.

One long and three short: memory error.

One long and eight short: the monitor data cable or graphics card is not plugged in properly.

2. If there is no alarm sound, the speaker may be broken. Please follow the following steps.

A. Check the memory, take it out, wipe the pins with rubber, and insert it into another slot for debugging. If there are more than two memories * * *, please use only one memory for debugging.

B, check the video card, check whether the video card is plugged in, take it out and use an eraser to check the pins, and then try the machine again. Then unplug the connection between the video card and the monitor, and try the machine again to see if it will enter the next self-test. If possible, try replacing the video card.

C, check the motherboard, first take the motherboard out and put it on an insulated plane (such as books or glass), because sometimes the chassis deformation will cause poor contact between the motherboard slot and the board card. Check whether there is any foreign matter in each slot of the motherboard and whether the gear is oxidized and discolored. If you find that one or two gears are different in color from other gears, it must be caused by oxidation or dust. Please scrape off the gear surface with a knife, then plug in the circuit board before debugging. Then check whether the wiring between the motherboard and the buttons is normal, especially the hot start button. Finally, try to reset the BIOS by discharging. The method is to remove the button cell from the motherboard, and then install it five minutes later, or directly install the battery backwards for two seconds, and then try the machine to see if it is normal. If possible, try replacing the motherboard.

D, check the CPU, if it is caused by CPU overclocking, then resetting the above BIOS should solve this problem, if it is not overclocking, then check whether the fan is normal, if it is not, try replacing the CPU.

E, the power supply is not good also can appear this kind of phenomenon, conditional try to replace the power supply.

F. If the above methods can't solve the problem, please unplug all hardware except CPU, motherboard, power supply, memory and graphics card, and then try the machine to see if it is normal. If it is normal, after eliminating the possibility of power supply and motherboard problems, solve it with the following method of fault phenomenon 4. If the debugging is not normal, try to replace these components separately.

Symptom 3: There is no image on the monitor after booting, but the machine reads the hard disk. Judging from the sound, the machine has entered the operating system.

Analysis: This phenomenon shows that the host is normal, and the problem lies in the monitor and graphics card.

Inspection ideas and methods: check whether the connection between the monitor and the graphics card is normal and whether the connector is normal. If possible, try replacing the video card and monitor.

Symptom 4: Display the graphics card and motherboard information after booting, but the self-check process stops when it reaches a certain hardware.

Analysis: The information display of motherboard and graphics card shows that the internal self-check has passed, and the motherboard, CPU, memory, graphics card and monitor should be normal (but improper BIOS setting of motherboard, poor memory quality and unstable power supply can also cause this phenomenon). The problem lies in the possibility of other hardware. Generally speaking, the BIOS self-check can't be found if the hardware is broken, but the next self-check can be carried out. If the self-check is stopped due to hardware reasons, the fault is serious, and it may be that there is something wrong with the hardware circuit. ).

Desktop power can't start: check ideas and methods 2

1, solve the motherboard BIOS settings can be used to discharge, or enter the BIOS to modify, or reset to factory settings (refer to the motherboard manual for steps). One thing to note about the modification is that in BIOS settings, if the alarm item of keyboard and mouse is set to stop self-checking when there is a fault, this phenomenon will also occur if the keyboard and mouse are broken.

2. If you can understand the process of self-checking, generally speaking, the BIOS will stop working when it detects a piece of hardware, so it is likely that the hardware is out of order. You can unplug the power cord and signal cord of this hardware and start it to see if it can enter the next self-check. If yes, there is something wrong with this hardware.

3. If you can't understand the self-check process, please unplug all power and signal lines of floppy drive, hard disk and CD-ROM drive, and unplug all boards such as sound card, modem and network card (except the memory of graphics card). Disconnect all external devices such as printers and scanners, and then reinstall them in the order of hard disk, floppy drive, CD-ROM drive, board card and external devices. After installing a piece of hardware, start the machine and test it. When there is something wrong with a piece of hardware, it can be judged that it is this fault.

Symptom 5: Passed the self-test, but failed to enter the operating system.

Analysis: This phenomenon indicates that the boot file cannot be found. Either there is something wrong with the hard disk or the operating system is broken.

Desktop power can't start: check ideas and methods 3

1. Check whether the hard disk is found during the system self-test. If you can't understand the self-check, you can try again with the startup disk, put in the CD with CD-ROM drive or startup floppy disk, and change the BIOS setting to CD-ROM drive (floppy drive) startup. After rebooting to disk A, press "C:" and press Enter.

2. If you can access the C drive, there is something wrong with the operating system. Reinstall the operating system;

3. If drive C cannot be accessed, the hard disk or partition table is damaged. Using partition software to judge whether partition is feasible. If partitioning is impossible, the hard disk is broken, and vice versa. Re-zoning can solve this problem.

Symptom 6: Crash shortly after entering the operating system.

Analysis: There are many reasons for the crash after entering the operating system. Here we only discuss the hardware problem, and consider it from the hardware aspect. The problem should be the heat dissipation of memory, power supply, CPU and various hardware.

Desktop power can't start: check ideas and methods 4

1, open the chassis, and observe whether the graphics card, the fan of the CPU power supply rotates normally, whether there is much dust on the heat sink, and whether the chassis is dirty (if the dust must be cleaned, the power supply must be cut off). Touch the hard disk to see if it is hot. It's slightly hotter than your hand in normal state. If it is hot, it can be determined that there is something wrong with the hard disk.

2. If the CPU is overclocked, please reduce the frequency.

3. Faults caused by poor quality of power supply, memory and motherboard can only be determined after replacement and debugging respectively.

After the system is turned on, the fan rotates and the light is on. Even if the display screen is not displayed, the light on the display screen flashes like it is not turned on. What should I do?

First, unplug all the plugs behind the host.

Press the start button 15 to discharge static electricity to the host. Sometimes static electricity will cause this problem when the weather changes.

Plug those wires back in as they are, open them and see if they are normal. If not, then look down.

Start with the hardware:

1, unplug the power supply,

2. Disassemble the chassis,

3. Press the memory and card inserted into the motherboard.

4. Pay attention to see if there is Explosicum phenomenon in the capacitance of the motherboard.

Desktop power failed to start. Solution 2:

There are many situations when starting, and each situation corresponds to many reasons.

Press the power button, there is no response. Generally, the power supply or motherboard is damaged.

Pressing the power button has a boot response but stops immediately, and the motherboard or CPU is damaged.

Pressing the power button has a boot response, but nothing is displayed, and the graphics card or motherboard is damaged.

Pressing the power button has a boot response, but it drips. According to the law of sound (different motherboards are different), it can correspond to several kinds of hardware damage such as CPU, memory, hard disk, motherboard and graphics card.

When the power button is pressed, there is a power-on reaction, and the self-inspection can be carried out, but it stops in the middle of the self-inspection. According to the information provided by the self-inspection, it is generally the failure of the motherboard battery, hard disk, CD-ROM drive, keyboard and mouse.

If the self-check passes, the boot device cannot be found. This is a hard disk failure, which may be the damage of the boot sector of the hard disk or the damage of the operating system startup program.

Self-check passed, Windows logo appeared or the selection menu was started, but it could not continue. This is system damage.

The self-check passed, and the windows desktop stuck, which was caused by the damage or conflict of the startup program.

The above 1-5 is a pure hardware fault. Please find someone to handle it if you are not a computer expert. 6 is a semi-soft and semi-hard problem. The software can try to fix it, but if it can't be fixed, the hard disk needs to be replaced. The possibility of 7 is relatively large, and reinstalling the system can solve it. If it is 8, it can be accessed through F8 security mode, and it can be solved by cleaning the related startup items.

Causes of insufficient power supply for extended desktop power supply

Computer power failure phenomenon:

1, the optical drive itself is in good condition. Due to the failure of the motherboard or data cable, some accessories have poor contact, which makes it impossible to read the disk. Solution: After eliminating the problems of cpu, power supply and other accessories through replacement, lock the fault on the power supply through replacement. Because the added optical drive makes the computer lack of power, it can't read the disk. The power supply can be replaced or the optical drive can be uninstalled, and the fault disappears.

Due to the lack of power supply, it will also lead to unreasonable restart of the computer, and it is also necessary to replace the power supply with greater power.

2. The computer is not working properly or its performance is unstable.

Turn on the main power of the computer and observe whether the "power" and "hard disk" indicators of the computer light up slightly. Press the "Power" button, and the computer will start self-checking the CD-ROM drive and hard disk. After the self-check, it can't be used. Even if you press the restart button of the computer, there is no response, but sometimes it can start normally and its performance is unstable.

This kind of fault is generally caused by the mismatch between power supply and other components, mainly in the following aspects.

The starting pulse width provided by 1. power supply cannot meet the requirements of the motherboard.

2. The pulse width of starting atx switching power supply provided by the motherboard cannot meet the power supply requirements.

3. When starting the motherboard, hard disk and other equipment, the instantaneous current demand is too large, resulting in over-current protection of power supply.

Solution: Replace the high-power power supply. If the problem cannot be solved after replacing the power supply, consider replacing the motherboard.