How do I reboot, power cycle ProLiant server in iLO?

The options to restart a server using the iLO are contained under the virtual power tab.  You can do one of four options:

1. Momentary press – this is like pressing the power button on your laptop/pc or server, with Windows 2000 and above (if I remember correctly), it should cleanly shut down the operating system.
2. Press and hold – this is like pressing and holding the power button, it will turn off the computer completely and will not cleanly shut down the server.
3. Cold boot of the system – this effectively powers off the server and restarts it.
4. Reset system – this is the iLO way of rebooting it without cleanly restarting the operating system, if your server has hung and wont respond, this might be the option you select.