To start the computer from a remote machine. You need to set BIOS enable function of Wake on Lan.

Install wakeonlan.

wget http://gsd.di.uminho.pt/jpo/software/wakeonlan/downloads/wakeonlan-0.41-0.fdr.1.noarch.rpm

or

rpm -Uvh wakeonlan-0.41-0.fdr.1.noarch.rpm

Displays:

warning: wakeonlan-0.41-0.fdr.1.noarch.rpm: Header V3 DSA signature: NOKEY, key ID 91bd851b
Preparing... ############################ [100%]
1:wakeonlan ############################ [100%]

You need to know MAC address of the computer first you'd like to start from remote. It's possible to know 'ifconfig' command.

MAC address is just the section 'HWaddr :::::'. Then input the commands below from remote machine and start computer.

wakeonlan **:**:**:**:**:**