The CPU fan turns on, but the monitor does not turn on. The solution is as follows: Turn on the computer, and press on the computer host Power button. If the indicator light on the host is on, it means your host is powered on. If it doesn't light up, it means there is no power.
First unplug the computer power cord and press the power button on the chassis 5-6 times. Release the residual charge on the motherboard. Then open the side panel of the chassis and insert and remove the memory slots. Remove the CMOS battery from the motherboard and reinstall it after 1 minute. If your computer has a separate graphics card, it is best to plug and unplug the graphics card.
Replace the memory slot. \x0d\x0a Check the capacitors and resistors on the motherboard to see if there are bulges in the capacitors and if there is a burnt smell on the motherboard, and clean the dust on the motherboard.
But it is usually related to the motherboard, CPU, COMS setting errors and power supply. It is recommended that you clear COMS when the power is off and try to restore the default settings of COMS. Method 2: The fan can start, indicating that the motherboard power supply is normal.
If the problem cannot be solved by wiping and unplugging, it is recommended to replace the display card for testing. CPU failure, which is less likely but still exists. After troubleshooting the BOIS, memory, and graphics card, you can try to replace the CPU for troubleshooting.
If there is no problem with the monitor, check whether the CPU fan is running. If it is running, use a multimeter to measure whether the voltage output is normal ±12V, ±15V. If it is not normal, you can try another power supply.
Power supply problem, please check whether the power socket is normal and whether the power cord is normal. If there is a problem with the power supply of the chassis, please check whether there is a 5V standby voltage and whether the connection between the motherboard and the power supply is loose. If you cannot measure the voltage, you can try to find a different power supply and try it.
Please try to press the function key combination to increase the screen brightness and switch the display on and off to avoid the screen brightness being too low or the computer screen being black due to the screen being turned off.
When the computer turns on and the screen goes black but the fan spins, it is usually caused by poor contact between the monitor cable and memory and other hardware. You can disassemble the computer to check each component, remove dust and reinstall it.
The computer can be turned on, the fan can rotate, but the display does not light up and the keyboard does not light up. Check whether the graphics card is in poor contact, remove the graphics card, insert the gold finger, and clean the dust. Check whether the monitor graphics card cable is in poor contact. If you have discrete and integrated graphics cards, check whether the wrong graphics card is connected.
Solution: Disassemble the main case, remove the memory module, wipe it with alcohol, and wipe away the dust. Plug the memory module back into the motherboard. If it still doesn't work, the memory module may be damaged. Replace it with a new one and try again.
Method 1: Check whether the power light of the host is normal. If it displays normally, the power supply problem is ruled out. Otherwise, the power supply needs to be replaced. Method 2: You can judge based on the BLOS power-on self-test alarm sound. Method 3: Unplug the CPU, memory, graphics card and other plug-in cards, wipe their golden fingers with an eraser, and then plug them back in or change the socket.
The computer does not respond when it is turned on, and the monitor screen is black, but the fan is turned on. When the computer is turned on, the fan is turned on. The monitor does not respond, and there is no alarm sound. There must be a problem with the computer hardware. It is best to use the replacement method to eliminate the problem and judge. Method: Press the capitalization switch key on the keyboard.
The computer cannot be turned on and the display light does not light up, but the host can be turned on, the fan is spinning, and the keyboard and mouse are both on. What is it? It should be caused by poor hardware contact.
First check whether the signal line of the monitor is in poor contact. If it still doesn't work, replace the monitor for testing, or ask a computer company to help repair the monitor. After the screen goes black, the computer host also stops working and the lights do not light up (the host is powered off). This is the check main box. After unboxing, first check whether the CPU fan is working properly.
Please try to press the function key combination to increase the screen brightness and switch the display on and off to avoid the screen brightness being too low or the computer screen being black due to the screen being turned off.
When you find that the computer does not respond when you turn it on, and the power indicator light does not light up, then there is probably a problem with the power supply. You can check whether the power cord of the host computer is connected to the external power supply. The CPU fan inside the computer is running normally. Check whether the monitor power indicator light is on and whether the monitor data cable is well connected.
The hard disk indicator light does not light up, and the power cord and data cable are unplugged. If the LOGO or BIOS information still cannot be displayed (black screen) after powering on and restarting, continue disassembly and keep only one memory on the CPU motherboard (keep the independent display if there is no integrated display). Restart and try again until the screen is displayed (except for no signal input). Add devices one by one, and finally connect the hard drive.
The computer does not respond when it is turned on, and the monitor screen is black, but the fan is turned on. When the computer is turned on, the fan is turned on. The monitor does not respond, and there is no alarm sound. There must be a problem with the computer hardware. It is best to use the replacement method to eliminate the problem and judge. Method: Press the capitalization switch key on the keyboard.
The power indicator light is on when the computer is turned on, the fan is spinning, the screen is black when the computer is turned on, and the keyboard light is not on: it may be caused by a loose memory module or too much dust. You can remove the memory module. 2. Clean the gold finger of the memory module with a clean rubber blade. And use a soft brush or leather blower to clean the memory slot, and then install it, the general problem can be solved.
It is a common computer fault that the host is turned on but the display does not light up when the computer is turned on. There are many ways to solve this problem.
The video cable is incorrectly plugged into the integrated graphics card. Connecting the video cable to the independent graphics card socket can solve the problem. The graphics card is faulty. Replacing the graphics card can solve the problem. There is a problem with the PCI-E slot of the motherboard. It is recommended to return it to the factory for repair. Monitor failure, replacing or repairing the monitor can solve the problem.
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