The computer starts up and displays the detection signal line, which indicates the poor contact of the display signal line, etc. Solution: turn off the power supply of the monitor and the host, and then try to plug in and out the connecting wires at both ends of the monitor again; After power on again, continue to test. If the problem is still not solved, you can debug the button on the display screen.
The computer startup display detection signal line may be caused by poor contact between memory and memory slot, and poor contact between graphics card and graphics card slot. Solution: you can cut off the power first, open the car, pull out the memory, wipe it back and forth with an eraser against the part of the golden finger (that is, the place with copper), and then insert it back into the memory slot. If you have an independent graphics card, you can also use the same method as above, and then plug it back into the graphics card slot. Finally, install the machine and restart the computer. （JianCeXinHaoXianZenMeJieJue）