First, review these basic troubleshooting steps before continuing.

  1. Be sure the power cord is firmly connected to the PC.
  2. Be sure the power supply unit (PSU) switch set to ONE, “1”, not ZERO, "0".
  3. Be sure to test by switching to an alternate power outlet.
  4. Be sure that the front power switch is operational and wires are properly connected to the motherboard.

Does the PC power on now?