Why does the computer screen show no signal?

Reasons why the computer screen shows no signal: 1. Connection problem, you can re-plug and unplug the cable or replace it with a new one; 2. Monitor input source settings, you need to confirm that you have selected the correct input source; 3. If there is a graphics card problem, you can try to reinstall the graphics card in another slot; 4. If the monitor fails, you can try to connect the monitor to another computer; 5. If there is a power problem, try to replace the power cord, power adapter or socket; 6. BIOS settings , try to restore the default settings in the BIOS setting interface; 7. Operating system problems, try to restart the computer or enter safe mode.

#The operating environment of this tutorial: Windows 10 system, dell g3 computer.

The computer screen shows no signal. It is common in the following situations:

• Connection problem: First check whether the connection between the computer and the monitor is stable. The connection cable may be loose, damaged or the connection interface is incorrect. At this time, it is best to replug and unplug the cable or replace it with a new one to solve the problem.

• Monitor input source settings:If the connection between the computer and the monitor is normal, but it still shows no signal, it may be because the monitor’s input source setting is incorrect. . Some monitors have multiple input source options, such as HDMI, VGA, and DVI. You need to make sure you select the correct input source.

• Graphics card problem: No signal problem may be caused by a faulty graphics card. You can try re-plugging and unplugging the graphics card to make sure it is well connected. If there are multiple graphics card slots, you can try reinstalling the graphics card in another slot, or replace it with another graphics card for testing.

• Monitor failure: If the above steps have eliminated the problem, then it is likely that the monitor itself is faulty. You can try connecting the monitor to another computer to test. If the no-signal problem also occurs on other computers, it can basically be determined that the monitor is faulty and you need to contact after-sales service for repair or replacement.

• Power supply problem: Sometimes, power supply problems can also cause no signal display. Check whether the power cord is plugged in, whether the monitor is powered on, and whether the power cord is damaged. Try replacing the power cord, power adapter, or outlet to make sure the entire power system is working properly.

• BIOS settings: In some cases, the computer's BIOS settings may cause no signal to be displayed. You can try to press the button displayed when the computer starts to enter the BIOS setting interface, and then restore the default settings or adjust the corresponding setting items.

• Operating system problems: In rare cases, problems caused by the operating system may also cause no signal display. You can try restarting your computer or entering safe mode to see if that solves the problem.

Summary

There may be many reasons why the computer screen shows no signal, including connection problems, monitor failure, graphics card problems, power supply problems, BIOS settings and operating system issues, etc. By troubleshooting these possible causes one by one, you can find a solution. If you have trouble troubleshooting on your own, it is recommended to contact a professional for repair or consult relevant technical support.

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