The computer motherboard indicator light is red, which may mean that your computer has encountered a problem. PHP Editor Strawberry will help you understand the reasons for the red light and how to solve the problem. Read on for more details.
There are generally two situations when the indicator light turns on. One is a power-on indicator to the motherboard, and the other is a malfunction.
If the power is turned on normally, you can ignore the red light on the motherboard if it is on. If the power is turned on abnormally, the best way is to use the motherboard detection card to quickly find the fault code and solve it. The problem cannot be determined simply by the indicator light
When the computer is turned on, the fan only spins, the monitor does not respond, and the red light keeps flashing. There must be a problem with the computer hardware. It is best to use the replacement method to eliminate the problem. Judgment method:
1. Press Uppercase and lowercase keys on the keyboard. When the light comes on, it indicates a fault with the graphics card, monitor, or other hardware.
2. If the keyboard light does not light up, it means there is a problem with the memory, CPU, motherboard, or power supply. Solution: 1. The keyboard light does not light up. First wipe the memory stick with an eraser, and check whether there are any burn marks on the gold finger of the memory stick. Replace the memory slot. 2. Check the capacitors and resistors on the motherboard to see if there are bulges in the capacitors and whether there is a burnt smell on the motherboard, and clean the dust on the motherboard.
3. Remove the CPU fan, turn on the power, and test the CPU with your hands to see if there is a temperature change. If not, the CPU is not working, or the motherboard is broken, or the CPU is not plugged in properly. Re-plug the CPU.
4. Power supply problem. Although the power supply is powered on, the motherboard cannot work normally. Try replacing the power supply.
5. If the graphics card is loose or oxidized, the keyboard light will light up and the screen will not display. Wipe the gold finger of the graphics card with an eraser and check whether the capacitor on the graphics card is bulging.
6. Minimized test method, leaving only the power supply, motherboard, CPU, memory, graphics card, keyboard, and monitor. Unplug all other wires on the motherboard and use a screwdriver to short-circuit the switch pins. If If it is normal, add the remaining hardware one by one until the cause of the problem is found. Tip: The power should be turned off for all operations. If you are not familiar with computer hardware, it is recommended to find professional maintenance personnel.
Solution:
1. Plug in the power cord tightly, check the plug on the plug board, and confirm that the plug board is powered on.
2. Confirm that the wire from the host power supply to the plug-in board is good, then take the power supply and connect it to the 24P plug of the motherboard. Short-circuit the green and any black wires. If the power fan turns on, it means there is no problem with the power supply and the power fan does not work. It means the power supply is broken, replace it with a new one.
3. After confirming that there is no problem in the above 2 steps, unplug the switch wire connecting the motherboard and the front panel of the chassis, and use a screwdriver to short-circuit the two pins of the switch. If the fan rotates, it means there is no problem with the motherboard. If the fan If it doesn't turn on, it's probably a motherboard problem, so contact professional maintenance personnel to handle it.
4. Short-circuit the motherboard pins and the fan will rotate, but there is no response when pressing the switch button on the front panel. This means that the switch button is broken or stuck. Replace with a new switch button, or remove the stuck button.
Analysis: The fan rotates to indicate that the power supply has started, but there is no image on the monitor. The computer cannot enter the normal working state, indicating that the computer has not passed the system self-test, and the motherboard BIOS settings have not been output to the monitor. The fault should be in the motherboard. On the graphics card and memory. But sometimes inferior power supply and damaged display can also cause this fault. The following are the inspection ideas and methods:
1. If there is an alarm sound, it means there is a problem with the self-test. The alarm sound is set by the BIOS on the motherboard. There are two types of BIOS, namely AMI and AWARD. Most motherboards use AWARD's BIOS, and only the common alarm sounds are listed here. Long beeping: The memory module is not inserted tightly. One short: The system starts normally. Two shorts: CMOS setting is wrong and needs to be reset. One long and one short: memory or motherboard error. One long and two short: monitor or graphics card error. One long and three short: keyboard controller error. One long and nine short: The flash RAM or EPROM of the motherboard BIOS is wrong.
2. If there is no alarm sound, the speaker may be broken. Please follow the steps below. A. Check the memory, take out the memory and wipe the pins clean with an eraser, then change the slot and insert it into the test machine. If more than two memory sticks are shared, please use only one memory stick to test the machine. B. Check the graphics card. Check whether the graphics card is inserted firmly. After taking it out, wipe the pins clean with an eraser and install it in place before trying the machine again. Then unplug the connection between the graphics card and the monitor and try the machine again to see if it has entered the next step of self-test. If possible, try changing the graphics card. C. If the memory, graphics card, CPU and other devices are normal, then discharge the BIOS, use the isolation method, place the motherboard outside the chassis, connect the memory, graphics card, CPU, etc. for testing. If the computer can display, then install the motherboard Go inside the chassis and test until the cause of the fault is found. If the fault persists, the motherboard needs to be returned to the manufacturer for repair. (I don’t understand this step very well, but once when I was solving a similar problem with senior Fan Jianqi, he unplugged the power cord of the host and then long pressed the power button to discharge, which solved the problem)
Computer motherboard cpu lights up red
1. Poor contact between CPU or memory. Check to see if reinstalling or replacing the CPU and memory can resolve the fault.
2. The working frequency of memory, PCI-E or PCI does not match the external frequency, and a fault occurs. Generally, a CMOS discharge is performed to restore the CMOS to its default settings. Turn on the phone and try again.
3. The most common fault is poor contact of the memory module. Pull out the memory module, sweep the memory slot with a brush, and try plugging and unplugging it several times.
1. Check whether the monitor cable is firmly and reliably inserted into the host interface, and then check whether the contact between the graphics card and the motherboard I/O slot is good. You can re-insert the graphics card once to ensure that the graphics card is in place and in good contact;
2. Change to a confirmed normal monitor. If the screen is no longer black, the monitor may be damaged;
3. If the monitor is not Damaged, please check whether the CPU fan is running;
4. If a black screen still appears, remove all components except the CPU, graphics card, and memory module, and then power on and start the computer. If the memory is faulty, there should be an alarm sound. If it is not due to the memory, please change to a normal CPU and start the test again. If a black screen still appears, it is recommended to replace the motherboard;
5. Whether the system has installed software and update patches, if so, please uninstall the update files;
6. The computer is restarting after installing the software and is updating, resulting in a black screen , just wait for the update to be completed;
7. You can enter safe mode to repair the computer. If you cannot enter safe mode, please reinstall the system.
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