Why does the computer have no signal all the time?

What happens when the computer has no signal?

It could be a wiring issue. Perform a comprehensive check of the connection between the computer monitor and the main unit, and plug the cables back in.

If the fault persists, then we need to open the case to see if there are any substances such as metal in the case, which causes a short circuit in the computer host circuit, and then we smell the computer to see if there is a burning smell, and see if there are damaged components around the motherboard and around the CPU.

The material strength of desktop computer shells is generally higher than that of notebooks, and the computing speed is fast, and the hardware is protected from external damage in all aspects.

The reasons why the computer screen shows a black screen with no signal are as follows:

1. The data cable of the computer monitor is not connected or loose. If the newly installed computer is turned on for the first time, the host is running normally, and the display screen is black and there is no signal, you need to check whether the power is turned on and on, and look at the power indicator. If the monitor is powered on, turn it on and check whether the data cable between the monitor and the computer is connected properly.

2. The data cable of the computer monitor is wrong. Many new computers, because the motherboard and graphics card are ** interfaces, for independent graphics users, if the data cable is connected to the motherboard ** interface, this problem will occur. You'll need to connect its cable to a discrete graphics card** connector in your console.

3. The memory module is loose or dusty. If the memory is not plugged in properly, loose or there is too much dust, there will also be a black screen on the monitor and no signal, but the computer has been running, try to shut down the computer and power off and remove the memory module, clean the gold finger, reinstall, and try to install it in a different slot.

Considerations for choosing a computer monitor.

1. Pixel resolution. This one is up to you, and of course the big screen is used now.

2. Point spacing. The unit is millimeters, the smaller the dot spacing, the better, the smaller the dot spacing, the clearer the display graphics of the monitor, and the higher the grade of the display. This is equivalent to the spark-like screen on our previous TV, the smaller the distance between them, the more it looks like a line, so this is very important.

3. Refresh rate. The lower the refresh rate, the more flickering and shaking the image will be, and the faster the eyes will fatigue. The higher the refresh rate, the more natural and crisp the image will be. This is the more important part of the display, and this has something to do with the system graphics card.

4. Screen size and maximum viewing area. Generally, the maximum viewing area of a monitor will be smaller than the screen size, for example, the maximum viewing area of a 15-inch monitor is inches.

If you are sure that there is no arrears of bandwidth, it may be the cause of a network cable failure, or a regional failure, just check it yourself.

No signal on your computer? It should be no network, mobile phone and computer, are you confused?

The first consideration is the connection cable between the monitor and the host, but you have ruled out this situation, then there is another situation that is --- hardware, which means that the probability of graphics card and memory will be slightly larger. Please unplug the memory first and use white paper (it must be white paper, not toilet paper. Carefully wipe the gold finger of the memory, wipe it and reinsert it.

Then check that the link of the graphics card is correct, you can unplug and reinsert it.

What do you mean by no signal? Network? Or does it mean something else? network, check whether there is arrears, and whether the modem and routing indicators are normal.

Generally, there are three situations.

1.The graphics card is in poor contact with the display signal cable, so you can reinstall it.

2.The monitor itself is faulty, and this one needs to be replaced.

There are many possible reasons! This is what is often said to be a point that does not light up when repairing computers.

1.If it can be displayed just after turning on, you can hear the sound of entering the desktop, it means that the host hardware is fine, it may be that the resolution is too high and the display can not be displayed, so press the F8 key when you just turn it on, and select the safe mode to enter the lower resolution.

2.If there is no signal when you turn on the computer, listen to whether there is an alarm sound, if there is one, it may be caused by the loosening of the graphics card or memory, dial the graphics card or replug the memory and then turn it on.

3.If there is no alarm sound, it may be a problem with the motherboard or CPU, but generally the CPU rarely has problems, and the problem with the motherboard is more likely.

4.Power supplies can also cause this phenomenon. 5.Find the CMOS jumper on the motherboard and try it.