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There may be the following reasons:
- In the current environment, the circuit has not been laid and there is no electricity;
- The power strip switch connected to the computer power cord is not turned on or the strip is damaged;
- The control switch of the computer power supply (some power supplies have a switch) is not turned on;
- The power switch of the host is not pressed;
- The mainframe switch is damaged or the switch wire is not plugged into the correct position of the motherboard;
- The mainboard battery voltage is too low;
- The Clear CMOS jumper on the motherboard jumped to the discharge position;
- The CPU is damaged;
- The motherboard is damaged;
- The computer power supply is damaged;
- The power cord is damaged;
- The auxiliary power supply plug on the motherboard is not plugged in;
- The power plug is not inserted into the power interface of the motherboard.