Why is there no signal when the computer is turned on?

No signal when the computer is turned on may be a monitor problem, graphics card problem, memory problem, power supply problem or other hardware problem, etc. Detailed introduction: 1. Monitor problem. Make sure that the power cord and data cable of the monitor are connected and the power is on normally. Try to use other devices to connect the monitor to see if the image can be displayed normally. If other devices can display the image normally, then there may be no problem with the monitor. , if the monitor has multiple input ports, please make sure you select the correct input source; 2. Graphics card problem, check whether the graphics card is plugged in properly. Some graphics cards require additional power supplies, etc.

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

No signal when the computer is turned on means that after the computer is turned on, the monitor cannot receive the signal from the computer, resulting in the inability to display images normally. This is a common problem that can be caused by a variety of reasons. Below I'll detail the possible causes and solutions.

1. Monitor problem:

First of all, we need to check whether the monitor is working properly. You can try the following methods:

- Make sure that the monitor power cable and data cable are connected properly and the power is on normally.

- Try connecting the monitor using another device, such as a TV or another computer, to see if the image displays properly. If other devices display fine, there's probably nothing wrong with your monitor.

- If your monitor has multiple input ports (such as VGA, HDMI, DVI, etc.), make sure you select the correct input source.

2. Graphics card problem:

If the monitor is working normally, it may be a graphics card problem. You can try the following methods:

- Check whether the graphics card is plugged in properly. Some graphics cards require an additional power supply, make sure the power cable is connected correctly.

- If you have multiple graphics card slots, you can try plugging the graphics card into another slot.

- If you have multiple display output ports, you can try changing the connection port, such as changing from HDMI to VGA or DVI.

3. Memory problem:

Sometimes, there is no signal when the computer is turned on, which may be caused by memory problems. You can try the following methods:

- Check whether the memory module is inserted properly. You can remove the memory module and reinsert it to make sure it is tight.

- If there are multiple memory slots, you can try to replace the memory module with another slot.

- If there are multiple memory sticks, you can try to insert only one memory stick, and then test each memory stick one by one to determine whether there is a damaged memory stick.

4. Power supply problem:

No signal when the computer is turned on may also be caused by a power supply problem. You can try the following methods:

- Check whether the power cord is plugged in and make sure the power switch is on.

- If you have multiple power sockets, you can try changing the sockets.

- If you have a backup power supply, you can try replacing the power supply.

5. Other hardware problems:

In addition to the above problems, there are some other hardware problems that may cause no signal at boot, such as motherboard failure, CPU failure, etc. These problems generally require professional diagnosis and repair.

To sum up, no signal when the computer is turned on may be caused by monitor problems, graphics card problems, memory problems, power problems or other hardware problems. We can investigate the situation one by one and try corresponding solutions. If none of the above methods work, it is recommended to contact a professional for further diagnosis and repair. Most importantly, do not disassemble or replace hardware at will to avoid causing greater damage.

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