When the computer display screen shows "no signal", the following steps can be taken to troubleshoot and solve the problem: 1. Check the hardware connection
1. Check the data cable: Ensure that the data cable (such as HDMI, VGA, DVI, or DisplayPort cable) between the monitor and the computer is connected correctly and securely. Check for any signs of damage or aging on the data cable, and if so, try replacing it with a new one.
2. Check power cords: Ensure that the power cords for the monitor and computer are properly connected and the power outlet is functioning properly. 2、 Check the computer host
1. Graphics card inspection: If it is an independent graphics card, check whether the graphics card is correctly installed on the motherboard and well connected to the data cable of the monitor. Try unplugging the graphics card, cleaning the dust on the golden finger with an eraser, and then reinsert it. If there are extra graphics cards, you can try replacing the existing ones for testing.
2. Memory module check: Try unplugging the memory module, cleaning the dust on the gold finger with an eraser, and then reinsert it. If there are multiple memory modules, you can try inserting only one memory module for power on testing to determine if any memory module is damaged.
3 BIOS/UEFI check: Restart the computer and enter BIOS/UEFI settings to check if the monitor and graphics card are detected. Sometimes it is necessary to adjust the startup sequence or other settings to ensure that the monitor can receive signals properly.
4 CPU and cooling system inspection: Check if the temperature of the CPU is too high. If it is too high, it may be due to abnormal operation of the heat sink or fan, causing CPU overheating protection. Ensure that the radiator and fan are functioning properly, and that the cooling channels are unobstructed. 3、 Display settings and driver updates
1. Monitor settings: Ensure that the input source of the monitor matches the port connected to the computer. For example, if a computer is connected to a monitor through an HDMI cable, the input source of the monitor should be set to HDMI.
2. Driver update: Visit the official website of the graphics card manufacturer to download and install the latest version of the driver program. After installation is complete, restart the computer to see if the problem is resolved. 4、 Other investigation methods
1. Minimum System Method: Unplug the data cables of the hard drive, floppy drive, and optical drive, and then check if the computer can boot up. If the computer monitor shows a startup screen, it indicates that the problem may be with these devices.
2. Replacement method: Try connecting the monitor to another computer for testing, or use another monitor to connect to the current computer to rule out issues with the monitor itself.
3. Check for electromagnetic interference: If there are high-power appliances or other electronic devices near the computer and monitor, they may interfere with signal transmission. Try moving these devices away to reduce electromagnetic interference. 5、 Professional maintenance
If none of the above methods can solve the problem, it may be a serious hardware malfunction inside the monitor or computer host. At this point, it is recommended to send the equipment to a professional repair center for maintenance.
When the computer display screen shows' no signal ', it is necessary to investigate and solve it from multiple perspectives. By checking hardware connections, computer host, monitor settings, and driver updates, the root cause of the problem can be identified and appropriate solutions can be taken.