Even if there is no grounding wire on the wiring board of the host, it is necessary to short-circuit between the motherboard and the copper column. The concept of motherboard ground wire is not limited to a few screw holes, and the whole ground wire system is interlinked, which is "* * * ground". USB also has a ground wire, and part of the ground wire of the front USB jack is connected to the chassis. Haven't you connected the front USB yet? What about other equipment? VGA, DVI and HDMI all have ground wires. Do you still connect them to the motherboard? What should I do if I get static electricity?
Grounding is very simple, just connect the chassis to the ground with wires, instead of tiles and wooden floors, use something that can conduct electricity on the ground, such as various pipes, or connect it directly from the wiring board.