1. It can be powered on but not lit
1. There is no alarm sound display of Didi when starting, maybe it is poor memory oxidation contact or there is a problem with the memory itself, the solution is to wipe the memory with an eraser and reinsert it back after the power failure, and replace the memory with its own problem.
2. There is no output when the power is turned on, first admit whether there are other cards inserted in the machine, and if there is, take the card down first and then power on the test.
3. There is no alarm sound when the machine is turned on, but the display is not displayed, you can first discharge the CMOS, and then turn on the test, if it still does not light up, it may be that the CPU is in poor contact, and wipe the CPU gold finger with an eraser after power-off. Replace the CPU that can't be solved yet.
4. If the problem still cannot be solved after replacing the CPU, consider replacing the motherboard.
2. Maintenance after the machine is powered on
The symptom of power-on maintenance is that the power is immediately lost after powering on. Use a multimeter to measure the resistance between the voltage and the ground is 0, or the buzzer will sound often.
First determine whether the power supply is maintained, remove the power connector from the motherboard and use a metal object to short the green wire and any black wire on the power supply 20pin, if the fan behind the power supply can be rotated, generally speaking, the power supply is no problem.
1. Motherboard maintenance, maybe the motherboard has a short circuit, such as screws falling inside, or water ingress.
2. Power maintenance, damage to the power supply itself.
3. If you use the adapter for power supply, pay attention to whether the positive and negative poles are connected.
3. The machine can be lit up after powering on
1. However, if the grub is at fault or there is a cursor shining in the upper left corner after the self-test, it is mostly because the main guide record of the system is damaged, and the main guide record should be rebuilt.
2. The blue screen during the start-up process, generally confirm whether the form of the hard disk is correct, winxp contains winxp as the IDE form, win7 or above including win7 can be used in the form of IDE or ahci, if the form is not a problem or the blue screen can be considered into the security form first, if the blue screen is still in the blue screen, you can consider reinstalling the system, if not, use the eraser to wipe the gold finger clean and plug it back in, maybe replace the memory.
3. After powering on, if you enter the BIOS directly without any operation, you generally do not recognize the hard disk, you can first check whether the hard disk is loose, and there is no loose replaceable SATA cable and hard disk.
USB can't be used after booting into the system, if it's a dedicated 3.0 chip, you have to drive it, and reinstall the system in other situations.
4. If the boot is started normally but does not appear, it can be made a brief judgment according to the keyboard digital light on, as well as the indicator light of the hard disk, if the hard disk light can be flashed when booted, the keyboard digital light can be switched on and off, generally speaking, the machine is now started normally, there is no display, one may be multi-display, the display device that is connected after the boot is turned on, this situation can be connected to the graphics device first and then turned on, and the other has an independent graphics card, the graphics device must be connected to the independent graphics card.
5. The machine can be powered on, but it will restart continuously, you can initialize the BIOS before testing, and then change the memory test if it can't be solved.
6. Under the normal condition of the machine, sometimes the hard disk is wrong or the hard disk is lost, you can change the form of the hard disk in the BIOS.
7. It can enter the system normally, but there are some spots on the display screen, you can disable the graphics card to see the situation, if there is no disable, it may be related to the CPU, you need to replace the CPU, and then test.
8. If you find that the system is not right at the time, you can adjust the time first, and then turn off the 220V power supply after shutting down (that is, the 220V power supply line should be taken down from the machine, if you don't take it down, the test results will not be accurate), and then power on after 2 minutes to see the time, if it can be normal, there is generally no problem, can not save the moment, first use a multimeter to measure the power of the button battery, whether there is a power supply of about 3V, the minimum can not be less than 2.9V, if the power is lacking to replace the battery. If the battery is normal, but it still can't be saved at all times, the motherboard circuit may be abnormal.
9. There is a blue screen in the process of machine use, restart, or crash, you can first look at the heat dissipation of the machine, (CPU fan, chassis fan, whether there is abnormality), and the other is to sweep away these conditions caused by system and software problems, after the previous cleaning, the problem still exists, you can test whether the hard disk has bad sectors, whether the memory of the commonly used software MHDD (with winpe has this thing) memory has an error, and the commonly used software MEMTEST (winpe has this thing).
10. Other serial ports are abnormal can be tested with the serial port debugging helper, before the test, you need to have a short receiving and sending foot 2, 3 feet, open the serial port debugging helper to send data, can send and send, send and receive consistently, and the serial port is generally normal.
11. If the light source ID cannot be connected, or the button board cannot be controlled, you can first measure whether the power supply 24V is normal, if there is a common situation of 24V, the light source control board is faulty. When there is no 24V, first measure whether the voltage at the input end of the boost module is normal, (there are two conditions of 12V and 19V), if it is normal, the general condition is that the boost module is faulty. There is no voltage to analyze.
12. The common keys to enter BIOS settings are DEL and F2, and the shortcut boot keys are F7, F11 and F12.
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