The computer doesn't work, the light doesn't work
The third step: if not, then clean the dust on the motherboard, and then check the computer is normal.
The second step: if the fault persists, check whether the excess metal chassis and then open the main chassis, or deformation caused by short circuit board, the chassis has no smell of burnt paste flavor, the motherboard has no burnt chip capacitor around CPU are damaged.
The first step: first of all, check the computer's external wiring is connected, put each line re inserted, to see if the failure is ruled out.
The fourth step: if the fault persists, then unplug the Reset line on the motherboard and other switches, light connection, and then short-circuit switch with a screwdriver to see whether it can boot.
