Kickstarting an install on a Dell R720 system results in a hang at the error: 'Detecting hardware...'

Solution Verified - Updated -

Issue

When attempting to install a Dell R720 system there is a hang see as below:

mounting /tmp as tmpfs
running install
running sbin 
detecting hardware...

The same install works on a Dell R710 but not R720. This system has four built in netextreme cards connected to one port, interface eth0.

Environment

Red Hat Enterprise Linux 6

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