Check the power supply, but more likely to be bad VR3 Voltage regulator IC.
The root cause of the problem is due to bad 3.3V Voltage regulator VR3 on the main board, it is putting out more than 3.3v which caused the mointor sensing circuits which is use to find out if the correct power supply is being used with monitor to malfunction. If you do not change the regulator, it will cause more damage since the voltage will be too high. Taping off the pin is a band aid fix but more damage will occur.
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