Monitor black screen after hardware maintenance

Computer use has always been normal, once on the chassis to remove the parts of the dust removal, reinstall after the boot, the monitor is not displayed. Reinstall the parts again, without resolving the failure. The speaker has a 1 long 2 short alarm, indicating that there is a problem with the monitor or video card, using the replacement hair to check, both are not a problem.

Put the video card and monitor back to the faulty computer, found that the video card is not fixed on the chassis, only the graphics card plugging, when the chassis pushed to the wall, the graphics card output line behind the chassis to withstand the wall and caused the graphics loose, resulting in the failure occurred.

Many users who often disassemble and dismantle computers ignore the installation of screws between the board and the chassis, which not only have fixed board functions, but also have the effect of grounding. Do not install screws not only easy to cause board contact is not good, serious will also due to the poor grounding of the board can not work properly.