Aegis power button
Trident power button
Please follow the troubleshooting methods to proceed：
Check whether the power adapter is correctly attached to the PC and to the wall.
Note: Some of the model has power On/off button on the power supply, please make sure it’s on.
Aegis power adapter
Trident power adapter
Remove the cables of mouse, keyboard, internet, monitor and so on.
Check whether monitor plug is correctly attached.
Check whether power button is on.
Check whether the user upgraded hardware by himself, for example memory, SSD, wireless network card etc. If yes, please remove updated hardware and install original hardware to test again, then Check whether the error disappears.