RHEL 4 Update 3/Centos 4.3 installation hangs during disk formatting on systems with ATI Rage XL video.
This is a known issue with the RHEL 4 Update 3/Centos 4.3 installer. The problem is described in this RedHat FAQ:
http://kbase.redhat.com/faq/FAQ_85_7889.shtm
The lockup can be avoided by: