The situation where a computer screen appears black and then lights up may be caused by various reasons. Here are some common reasons and corresponding solutions: 1. Hardware problems
1. Loose power plug or connecting wire: - Check if the computer power plug is securely plugged into the socket- Check if the connection cables between the monitor and the host (such as VGA, HDMI, DP cables) are securely plugged in without looseness or damage.
2. Graphics card issue: - If you are using a discrete graphics card, try unplugging the graphics card again to ensure that the graphics card slot and gold finger part are clean and free of oxidation- Check if the graphics card fan is working properly to prevent black screens caused by overheating.
3. Memory issue: Loose memory modules or oxidized gold fingers may also cause the screen to turn black. Try reinserting the memory module and wiping the gold finger area with an eraser.
4. Display malfunction: - The display itself may have malfunctions, such as aging backlight tubes, display circuit board issues, etc. You can try connecting the monitor to another computer to test if it works properly.
5 CPU or motherboard overheating:- When the CPU or motherboard overheats, the system will automatically shut down for protection, causing the screen to go black. Check if the CPU fan and motherboard cooling system are working properly, clean the dust and replace the cooling silicone grease if necessary. 2、 Software issues
1. System or driver issues: - System file corruption or driver incompatibility may result in a black screen. Attempt to update or reinstall graphics card drivers, as well as system updates and patches- If the problem persists, you can consider using the system restore function to restore to the previous stable state, or reinstalling the operating system.
2. Viruses or malware: - Viruses or malware may damage system files, causing the screen to go black. Run antivirus software for a comprehensive scan to remove viruses and malicious software.
3. Energy saving settings: The computer's energy saving settings may cause the screen to automatically turn off after a period of time to save energy. Check the power management settings to ensure that energy-saving settings do not cause the screen to go black. 3、 Other factors
1. External device interference: Some external devices (such as USB devices, external hard drives, etc.) may conflict with the computer, causing the screen to go black. Try unplugging all external devices and then troubleshoot the problematic devices one by one.
2. Power supply issue: - Unstable power supply or poor power quality may also cause the screen to go black. Try replacing the power supply to solve the problem. Summary of Solutions
1. Check hardware connections: Ensure that all hardware connections are secure and not loose.
2. Clean up dust and replace heat dissipation silicone grease: Keep the CPU and motherboard heat dissipation system clean to prevent overheating.
3. Update or reinstall drivers: Ensure that the drivers for critical hardware such as graphics cards are up-to-date.
4. Run antivirus software: Remove viruses and malicious software to ensure system security.
5. Check power management settings: Ensure that energy-saving settings do not cause the screen to go black.
6. Check external devices one by one: determine if there are any external devices causing conflicts.
7. Replace power supply: If the power supply is unstable or of poor quality, consider replacing it with a new power supply.
By following the above steps, you can gradually troubleshoot and solve the problem of the computer screen turning black and then turning on again. If the problem still cannot be solved, it is recommended to contact professional computer repair personnel for further inspection and maintenance.