When the monitor shows a black screen while the host is still running normally, you can try the following steps to debug and solve it: 1. Check the connection
1. Monitor power supply: Ensure that the power cord of the monitor is correctly connected to the power outlet and the power switch is turned on. Check if the indicator light on the monitor is on to confirm if the power is connected.
2. Connection cables: Check if the connection cables between the monitor and the host (such as VGA, HDMI, DisplayPort, etc.) are securely plugged in and not loose. Try unplugging or unplugging the cable, or replacing it with a new one, to eliminate any issues with the cable itself. 2、 Adjust monitor settings
1. Brightness and Contrast: Sometimes the brightness or contrast of the monitor may be adjusted to the lowest, causing the screen to appear black. Try adjusting these settings to see if they can restore normal display.
2. Input source selection: If the monitor supports multiple input sources (such as HDMI, VGA, etc.), make sure to select the correct input source. 3、 Software and driver troubleshooting
1. Restarting the computer: Sometimes restarting the computer can solve some temporary software conflicts or system errors. You can try long pressing the power button to force a shutdown, and then restart normally.
2. Entering Safe Mode: When restarting the computer, continuously press F8 (or other function keys for specific computer models, please refer to the computer manual for details) to enter the advanced boot option and select "Safe Mode" to start. In safe mode, the system will run with a minimal driver set, which helps determine if the issue is caused by third-party software or drivers.
3. Graphics card driver: Abnormal graphics card drivers may also cause black screen issues. You can try updating or rolling back the graphics card driver to solve the problem. 4、 Hardware troubleshooting
1. Graphics card: Check if the graphics card is securely inserted into the slot on the motherboard, and if necessary, unplug and plug it again. If conditions permit, you can try replacing a graphics card for testing.
2. Memory module: Check if the memory module is securely inserted into the slot on the motherboard, and if necessary, unplug and plug it again. Use memory diagnostic tools (such as MemTest86+) to test for any faults in the memory module.
3. Monitor: If none of the above steps solve the problem, it may be due to a malfunction in the monitor itself. At this point, you can try connecting the monitor to another host to determine if it is working properly. 5、 Other investigations
1 BIOS settings: Restart the computer and press a specific key (usually F2, Del, etc.) when the startup screen appears to enter the BIOS settings interface. Check if the display settings are incorrect, such as whether the display output selection is correct (especially important for multi screen settings). If any issues are found, adjust and save to exit to see if the problem is resolved.
2. Power issue: Although the host appears to be running normally, insufficient or unstable power supply may also cause the monitor to go black. Check the power cord and power socket to ensure stable power supply. Use a multimeter to measure whether the output voltage of the power supply is stable, and replace the power supply if necessary.
If none of the above methods can solve the problem, it may be necessary to seek professional technical support or repair services. During the investigation process, it is recommended to proceed gradually in order to accurately identify the problem and take corresponding solutions.