The first thing to start is to check the graphics card information. If you turn on nothing, you should check your graphics card. After the graphics card is fine, the BIOS information will be displayed. Then the memory detection, and finally the hard disk detection. After that. It is the detection of other devices. Finally, boot the system information to enter WINDOW XP
So we start from the possible and simple to detect
(1) First check whether the external power supply is normal and unstable?
If other people's computers are normal on the same power supply, it means that the external power supply is basically no problem. Then check if there is any problem with some sockets of the socket (such as poor contact of the socket, etc.)? Is the fuse of the socket blown? It is best to measure the voltage with a multimeter.
(2) Check if the KB and MOUSE interfaces are connected reversely. If the computer has this problem, the keyboard and mouse will not work, and some computers may even fail to turn on.
(3) Elimination method: dial out irrelevant external devices, such as devices on the sound card interface (such as speakers), devices on the LPT port (such as printers), devices on the two COM ports (such as external MODEM), KB and MOUSE, Internet cable, USB device, etc., each time you unplug a peripheral (note: the power should be turned off before unplugging), turn it on and try it to determine which component is faulty.
(4) Unplug the ATX power cord plugged into the motherboard power interface (the ATX power connector has two rows, a total of 20 connectors. If it is a P4 motherboard, you have to pull out the +/-12V power cable; for the old P4 motherboard, you have to Pull out the AUX power cord). Then plug it back in and try restarting. If it still doesn't work, go to the next step.
(5) When powering on, check carefully whether the fan of the power supply box or the CPU fan rotates? If you turn it, it stops. Generally speaking, there may be a short-circuit phenomenon in the computer components (such as the power supply itself, external equipment, boards inside the host, etc.), or the power provided by the power supply box may not be enough. At this time, you can press the next step.
(6) Disconnect the power cords of all equipment powered by the ATX power box (such as the power cords of optical drives, floppy drives, and hard disks, etc.). Then unplug the ATX power cord plugged into the motherboard power connector again. Because the green (for ATX special) and black are used together to use the switch connector equivalent to the ATX power supply, connect them with a wire. If the power supply fan rotates, it means just now The unplugged device is likely to have short-circuit components (because the power box is basically idling just now, that is, there is no load, so it may also be that the power provided by the power box itself is not enough. If possible, you may try to replace the power box. If the power supply box works normally, skip this step).
Plug back the power connector provided by the power supply box to the motherboard. If the computer fails to boot, use the following steps.
Explanation: We know that as a switching power supply for computers, it is the "source of power" for computers.
(7) Check whether the power switch interface (POWER SWITCH/ON, OFF) of the motherboard is normal?
Unplug the power cord on the motherboard, use a wire or a screwdriver to short-circuit the two power switch pins on the motherboard to see if the computer can start. If it can be started, it means that the switch part of the power supply is faulty (such as the internal circuit of the heat shrinkable tube is open, etc.), and it can be eliminated.
(8) Check whether the connection between the main board and the switches and indicators on the chassis panel is normal, such as whether the RESET button is short-circuited, etc. Follow the signs on the motherboard or the motherboard manual. If there is a problem, connect it according to the correct marking method. Note: If you unplug and plug the connection between the motherboard and the chassis panel, you should make a record of the original correct wiring so that you can restore it next time. At present, there are generally: POWER SWITCH, SPEAKER (some should pay attention to the positive and negative poles), RESET, HD LED or IDE LED (all LEDs that meet the characteristics of the diode should generally be distinguished between the positive and negative poles), POWER LED, SLEEP SWITCH, SLEEP LED Wait for the connection.
(9) Use the plug-in method to tentatively plug and insert the memory bar and expansion card inside the host. First of all, remove the memory and turn it on again to listen to whether there is an alarm sound (before ensuring that the speaker is normal), if there is no alarm sound, it generally means that other components are short-circuited or the motherboard, CPU and other components have failed. If there is an alarm sound after the memory is pulled out, but there is no alarm sound when the memory is plugged in, it generally means that the original memory module that was unplugged is faulty (that is, the first 64KB of the memory module is faulty); but it may also be that the memory installation sequence is wrong ( That is, you can only insert the first slot first, then the second slot and then the third slot...; or insert the third slot first, then the second slot and then the first slot... )!
Then, usually pull and insert the following boards in sequence (before unplugging and inserting the board, please cut off the power): network card, sound card, MODEM, game card, TV card, etc., each time a board is dialed, power on and try it, such as pulling out a certain The computer starts normally after the expansion card, which generally means that the expansion card is faulty.
Note: During this operation, sound alarms, information prompts, etc. are likely to occur. At this time, we can solve the problem according to the sound or prompt error message, such as: error report of memory, graphics card, keyboard, etc.
Note: If the memory module and the display card are faulty at the same time, the memory error will be reported first! ! This is related to the order of BIOS detection!
(10) Remove the CPU (can be removed together with the fan), and then discharge the CPU (that is, release the static electricity on the CPU pins, that is to say, put the CPU pins against the metal shell of the chassis or a clean ground) , And then reinstall the CPU and fan. Restart and try to start normally.
(11) If it is still abnormal, the CPU may be faulty. You can try to replace a good CPU that this motherboard can support.
(12) If it is still abnormal, it means that the motherboard is faulty, such as crystal oscillator, capacitor and other components. At this time, the motherboard should be sent to a professional location for repair
Note: The above content comes from the Internet and does not represent the views of this site. I hope some of the content can help you.
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