1. The static voltage of the cabinet is too high due to the humid air.
If it is rainy for a long time or the air is humid, it will lead to high electrostatic voltage in the computer case and numbness in the hands! If this is the case, it is recommended to strengthen indoor ventilation. You can put desiccant in the main chassis, and then clean the dust of the hardware in the chassis in time, especially the motherboard and power supply.
2. The pins of some hardware components touch the chassis.
Find the hardware, such as power supply, which is most likely to cause leakage in the chassis. In addition, the motherboard is not installed in place, and the chassis deformation causes the pins on the back of the motherboard to touch the chassis shell, resulting in leakage of the chassis.
3. The main chassis leaks electricity because the power plug has no grounding wire (mostly).
I suggest that you give priority to this problem. The leakage of the main casing is mostly caused by the lack of grounding wire in the power plug. We only need to connect the chassis with one wire, and then connect the other end to the bottom or wall.