Solutions:
The power cord is correctly connected to the rear of the computer and to a working electrical outlet.
If your computer has a secondary power switch on the rear of the computer, ensure that it is switched on.
The power indicator on the front of the computer is on.
The computer voltage matches the voltage available at the electrical outlet for your country or region.
Solution:
Ensure that the startup device sequence set in the Setup Utility program includes the device where the operating system resides. Usually, the operating system is on the internal storage drive. For more information, see Changing the startup device sequence permanently.
Solution:
Ensure that no keys are stuck.