Why does the computer show no signal when it is turned on?

The reason why the computer shows no signal when it is turned on may be connection problems, monitor setting problems, graphics card problems, BIOS setting problems, power supply problems, memory problems, etc. Detailed introduction: 1. Connection problem, first check whether the connection between the monitor and the computer is correct, make sure the video cable of the monitor is inserted into the graphics card interface of the computer, and make sure the connection is firm. Sometimes the video cable may be damaged or loose, resulting in no signal. , you can try to replace the video cable, or replug and unplug the video cable to ensure that the connection is normal; 2. Monitor setting issues, some monitors have multiple input source options, etc.

The operating system for this tutorial: Windows 10 system, DELL G3 computer.

When the computer shows no signal after it is turned on, it usually means that the monitor cannot receive the signal sent by the computer. This may be caused by a variety of reasons. Below I will introduce some common causes and solutions to help you solve the problem of no signal when the computer is turned on.

1. Connection problem:

- Check the monitor connection: First check whether the connection between the monitor and the computer is correct. Make sure the monitor's video cable is plugged into the computer's graphics card connector and that the connection is secure.

- Replace the video cable: Sometimes the video cable may be damaged or loose, resulting in no signal. You can try to replace the video cable, or replug and unplug the video cable to make sure the connection is normal.

2. Display settings issues:

- Check the input source: Some monitors have multiple input source options, such as VGA, HDMI, DP, etc. Make sure the monitor has the correct input source selected to match the computer's output connector.

- Adjust resolution: In some cases, the computer's resolution settings may not match the monitor's compatibility, resulting in no signal. Try setting your computer's resolution to an appropriate value that your monitor supports.

3. Graphics card problem:

- Check the graphics card connection: Make sure the connection between the graphics card and the motherboard is normal. If you are using a discrete graphics card, check that the graphics card is correctly inserted into the PCIe slot and make sure the connection is secure.

- Replace the graphics card: Sometimes the graphics card may fail, resulting in no signal. You can try replacing the graphics card, or inserting the graphics card into another available slot.

4. BIOS setting problems:

- Restore BIOS settings: Sometimes wrong BIOS settings may cause no signal on the monitor. Try to enter the BIOS setting interface and restore the default settings or adjust the corresponding settings.

5. Power supply problem:

- Check the power connection: Make sure the computer's power cord is securely connected and the plug is inserted into the power socket.

- Check the power supply: In some cases, insufficient power supply may result in no signal after the computer is turned on. Check that the power supply's power rating is sufficient to support the computer's hardware configuration.

6. Memory problem:

- Check the memory connection: The memory module is not inserted into the slot correctly, which may cause no signal. Please make sure that the memory module is inserted into the corresponding slot and that the connection is secure.

- Replace the memory module: Sometimes the memory module may be damaged or faulty, resulting in no signal. You can try to replace the memory module, or insert the memory module into another available slot.

7. Other questions:

- Check other hardware: Check other hardware devices, such as CPU, motherboard, etc., to ensure that they are working properly and compatible with other components.

- Contact technical support: If none of the above methods can solve the problem, it is recommended to contact the computer manufacturer's technical support or seek professional help.

It should be noted that the above are some common solutions, but the specific situation may vary depending on the hardware configuration, operating system and device model. If the problem persists, it is recommended to consult the computer manufacturer's technical support or seek professional help.

To sum up, no signal when the computer is turned on may be caused by connection problems, monitor setting problems, graphics card problems, BIOS setting problems, power problems, memory problems and other reasons. Solutions include checking connections, adjusting settings, replacing hardware, restoring BIOS settings, etc. Be careful when dealing with the problem of no signal when your computer starts up, and make sure to back up important data when necessary.

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