Turn off the system. Flip the PSU switch to off. Unplug the PSU. Press and hold the power button for 5-10 seconds. Plug the PSU back. Flip the PSU switch to on. Try powering on.
Turn off the system. Flip the PSU switch to off. Unplug the PSU. Press and hold the power button for 5-10 seconds. Plug the PSU back. Flip the PSU switch to on. Try powering on.