PowerEdge r430 and I'm currently unable to use a server computer

I'm using a PowerEdge r430 and I'm currently unable to use a server computer due to a strange phenomenon I've never experienced before.

The strange phenomenon is as follows.

- Server power is maintained.

- The monitor is not outputting anything (unplugging the cable will say no signal, and when connected, the monitor power light will turn orange. Blue light when normally output or disconnected)

- In this state, pressing the server's power button does not shut down. The cable must be disconnected.

- After disconnecting and reconnecting the cable, the power supply LED turns green. In this state, the server does not turn on when the power button is pressed. (Do not wait for a minimum of 2 minutes and a maximum of 1 hour before pressing the power button.)

- If you disconnect and reconnect the power cable for about 2 to 3 hours, it will turn on.

- The setup screen will output normally. Then, over time, the symptoms appear.

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