Activate WOL

BIOS: Linux / Windows

Enter the BIOS Setup at startup of the machine. Look for an Option like Power on by PCIE Devices, Power On by onboard Lan, On Board LAN boot (rom) (!) and set it to enable. It is usually under Boot or Advanced.

Note: Some newer Notebooks may only allow Boot On LAN in Sleep Mode to save Energy.

OS: Mac OS X

Note: Some Mac Mini (10.9) don't support WOL.

OS: Windows

To enable WOL under Windows:

OS: Linux