The power-on sequence is important. You cannot ignore details.
Turn on the external power switch of each device.
Press the power button on the controller enclosure.
Turn on the power switch of the Ethernet switch or Fibre Channel switch (if the Ethernet switch or Fibre Channel switch is configured but not powered on).
Power on the application server (if the application server is not powered on).
If a VM is available, power on the VM and start it.
