What does it mean when a desktop computer has no signal?

When we use the computer, there is no signal on the monitor after the computer is turned on, and the screen displays "No Signal" or "No Signal". I believe many users have encountered this situation. What is the reason for the lack of signal on the monitor after the computer is turned on? What about?

No signal from the desktop computer means that the host computer and the display screen are not connected properly, and a malfunction occurs.

Solution to the problem of no signal on the monitor after turning on the computer: (recommended learning: PHP video tutorial)

1, The data cable has poor characteristics or is not in close contact with the graphics card or monitor.

Check whether the external wiring of the computer is connected properly. Poor wiring contact may also cause the monitor to have no signal after booting. Re-plug and unplug the VGA cable, power cable, data cable and other connections to check if there is a connection problem.

There is another special situation, that is, the monitor VGA cable is connected to the wrong position. For machines with independent graphics cards, the VGA cable must be connected to the interface of the independent graphics card.

2. Check whether there are any excess metal objects in the case, or a short circuit caused by the deformation of the motherboard. Smell whether there is a burning smell in the case, whether there are burned chips on the motherboard, and whether there are any burnt chips around the CPU. Whether the capacitor is damaged, etc.

3. Dust is the number one killer of computer failures. If there is too much dust in the chassis, the memory, graphics card and slots will be in poor contact, and the hardware will be corroded. Therefore, the computer should be cleaned regularly. Clean the dust on the motherboard, wipe the gold finger with an eraser, and then check whether the computer is normal.

4, Motherboard

The onboard power circuit dissipates less power, causing insufficient power supply to the graphics card, and the onboard power circuit Serious leakage of the filter capacitor will cause the voltage of the corresponding power circuit to decrease, and may also cause the display to have no signal failure after the computer is turned on.

Unplug the Reset cable and other switches and indicator light connections on the motherboard, and then use a screwdriver to short-circuit the switch to see if it can boot normally.

6, Check the memory, graphics card, CPU, and motherboard.

Use methods such as plug-in and swap methods to check whether the memory, graphics card, CPU and other devices are normal. If the device is damaged, replace the damaged device.

7, If the memory, graphics card, CPU and other devices are normal, check the BIOS.

Discharge the BIOS, use the isolation method, place the motherboard outside the chassis, connect the memory, graphics card, CPU, etc. for testing. If the computer can display, install the motherboard into the chassis. Continue testing until the cause of the failure is found. If there is still a problem of no signal on the monitor after turning on the computer, the motherboard can only be returned to the manufacturer for repair.

Through the above introduction to the solution to the problem of no signal on the monitor after the computer is turned on, you should know how to solve it when you encounter the same situation. I hope that sharing this article will be helpful to everyone.

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