Enter the following text at the boot options prompt:
vnc=1 vncpassword=yourpasswordReplace yourpassword with the password to use for installation.
Select Installation then press Enter to start the installation.
Instead of starting right into the graphical installation routine, the system continues to run in text mode then halts, displaying a message containing the IP address and port number at which the installer can be reached via a browser interface or a VNC viewer application.
If using a browser to access the installer, launch the browser and enter the address information provided by the installation routines and hit Enter:
http://ip_address_of_machine:5801A dialog opens in the browser window prompting you for the VNC password. Enter it and proceed with the installation.
source:http://linuxpoison.blogspot.com/2010/06/135781677515133.html