How to turn on a PC using Wake-on-LAN: If you want access to your home computer wherever you are,you can turn your system on by sending a magic packet through LAN port. The message is usually sent by a program executed on another computer on the same local area network.
Wake-on-LAN in Your BIOS
To access your BIOS, restart your computer and press and hold the Delete key to enter the BIOS setup. Once you’re in the BIOS, select the Power management section and look for a Wake-on-LAN setting. Make sure it’s enabled, then save and exit your BIOS and start up your computer. Some BIOS will have a straight-up Wake-on-LAN option, and on some boards, you may have to enable a “Power On By PCI Devices” setting. The process of enabling wake-on-Lan option differ by board to board.
Wake-on-Lan (WOL) in windows
To enable Wake-on-LAN in Windows, right-click on My Computer icon, select Properties, then click on Device Manager or Manage tab directly by clicking right click on computer in win 7 and win 8. Find your network card in the hardware list, right-click it and click Properties again. Go to the Power Management tab and tick the checkbox next to Allow this device to wake the computer.
Now check the Advanced tab, which is full of options for your network adapter. Tweak the Wake-Up Capabilities (right below Wake From Shutdown), setting the value to Magic Packet. Hit OK and everything should be set. All set you can now send the magic packet to wake your system.
Applications for Waking Your Computer with WOL
For Windows, best application is Magic Packet Sender. It can save your WOL profiles so sending that command is quick and simple.http://magicpacket.free.fr/
Wake-on-LAN in OS X
To enable Wake-on-LAN for you Mac, open the Energy Saver Preference panel, click Options, and then tick the Wake for Ethernet network administrator access check box.