It's a joke that the host doesn't hang up.

1, in this case, first check whether the connecting cable between the computer and the host is normal.

2. If there is nothing wrong with the connecting cable, there may be something wrong with the hardware of the computer host.

Let's turn off the main engine first. For personal and computer safety, remember to turn off the power.

4. Unplug all cables behind the main unit in turn. Some plugs need to be loosened before they can be unplugged.

5. Use a Phillips screwdriver to unscrew the screws on the back of the main unit. After pushing the cover plate of the main engine, the main engine panel can be removed.

6. After opening the host, you can see the motherboard and other components. Usually, the failure of the black screen of the display is caused by poor contact of the memory stick.

7. Pull the buckles on both sides of the memory stick outward with both hands at the same time, and the memory stick can be easily removed.

8. Clean the socket of the memory stick with a clean brush. Then gently wipe the golden part of the memory card interface with the drawing eraser, and remember to wipe both sides.

9. Put the memory modules back on the motherboard in turn, cover the main chassis panel, tighten the screws of the main chassis, and plug all the connecting wires back into the corresponding interfaces. So you can turn on the power and try. Usually, the computer can start normally.