The display is black, but the computer is always running

- Jul 02, 2019-

In the process of using the computer, it is inevitable that hardware or system and software failures will occur. Recently, a netizen said that there is a fault in his computer. That is, after the boot, the display has no signal input on the black screen, but the computer host is always running. In fact, this fault has occurred. There are many reasons. We need to check it one by one to solve the problem. Let's share the solution that the monitor has no signal input after the boot, but the computer host has been running.


It is understood that the user's display black screen, and prompted no signal input, the display flashes yellow light, basically can not eliminate the problem of the display, but the computer host has been running, can hear or see the computer's CPU fan, power supply fan Waiting to turn again, so we need to check the video cable of the monitor and the host or the hardware failure in the host computer.


First, the display and the host video cable connection error


Display wiring error is a common problem encountered by users. Generally, such a host has a discrete graphics card installed, and many users insert the video cable of the display into the display interface on the motherboard. This is the wrong connection method, which causes the computer to fail. Normally turned on, there is no signal input on the black screen of the display. The user who integrates the graphics card is sure to insert the display interface of the motherboard, and it is not excluded that the video cable is loose, or the display screen is black due to damage of the video cable.


Second, the computer memory is not tight


If the computer memory is loose, it will also cause the computer to fail to boot properly. This chance is large, and it is recommended to give priority. Everyone will open the computer host, pull out the memory module after the side panel of the chassis is opened, and then re-install the memory in the memory slot. If not, it is recommended to change the memory to other memory slots, and then try to boot. If you have more than one memory friend, you may wish to insert a memory first, another memory is not inserted first, try to boot test, if not, then another memory is inserted, and this memory is not inserted, alternate test, does not exclude one The root memory is corrupted, or one of the memory is loose.


Third, the motherboard button battery discharge test


Button battery discharge is very easy, there will be a button battery on the motherboard, use the button or screwdriver to release the button battery button, then the CMOS battery on the motherboard will automatically bounce, then we directly remove it by hand Yes, put the button battery for ten seconds and reinstall it, we are testing it.


Fourth, observe the indicator light on the keyboard


Insert the keyboard into the computer host, we will boot the computer host, we try to press the "Num Lock" button at the top of the small number key on the keyboard, if it is pressed, it will be off, and then press it to light, indicating that the computer mainframe is running normally. Most of the problems are caused by video card failure or damage to the video cable of the monitor.


If you are a discrete graphics card and have an integrated graphics card, we recommend that you unmount the discrete graphics card, insert the monitor video cable directly into the display interface on the motherboard to boot, of course, it is not excluded that the discrete graphics card is not installed in place or a discrete graphics card. The power supply line is not inserted or loosened.

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