To test CentOS 5, I loaded from DVD adding it to a system at home running Fedora Core 7 T2. Partition Layout is: /dev/hda1 - / for the RH7T2 system /dev/hda2 - /home /dev/hda3 - swap /dev/hda4 - extended /dev/hda5 - / for CentOS 5 The system loaded cleanly and gave me the opportunity to tell grub about the other system. CentOS boots fine. Grub Stage 2 will show me both systems. However, If I choose the FC7T2 system I get the following output: Booting 'FC7T2' rootnoverify(hd0,0) chainloader +1 Error 13: Invalid or unsupported executable format Any clues on how to fix this? Note, I am posting to both groups since I follow both and cannot figure out which is the better choice. Robert E. Styma Principal Engineer (DMTS) Alcatel-Lucent, Phoenix