The regular installer we released for CentOS-6.3 does not work for UEFI enabled machine instances that do not have a BIOS fallback mode ( this includes physical machines as well as some virtualised environments ). To address this problem, we are releasing another minimal install image for CentOS-6.3/x86_64. This image has been tested on various IBM, HP and Dell hardware along with VMWare and VirtualBox virtualisation products. --------------------------- ISO Name: CentOS-6.3-x86_64-minimal-EFI.iso Sha256Sum: b6bcf0c7050458dcaccf40a05b08e3625d823d8e4d77ff0f67fb7b96655f043f If you are unable to verify the image using sha256, you can also get other checkums : md5 : mirror.centos.org/centos/6/isos/x86_64/md5sum.txt.asc sha1: mirror.centos.org/centos/6/isos/x86_64/sha1sum.txt.asc sha256: mirror.centos.org/centos/6/isos/x86_64/sha256sum.txt.asc --------------------------- I'm trying to make sure that we do enough testing and have enough resources for UEFI testing to ensure that the next and subsequent releases do not have a problem in this environment. In the mean time, the installer buildsystem for CentOS-6 has been updated to also build and test the UEFI requirements in sync with the rest of the installer build process. Thanks to the guys at VMware for working through this issue with us. As well as Christoph Galuschka and Pasi Kärkkäinen from the CentOS QA team for helping test this image. Feedback is welcome via either the issue tracker[1] or the centos-devel list[2]. And we are always looking for more people to come and join the testing effort, specially on platforms and environments we dont have exposure to at the moment. Want to help on that front ? Drop in on #centos-devel on irc.freenode.net and say hi. [1]: bugs.centos.org [2]: lists.centos.org/mailman/listinfo/centos-devel -- Karanbir Singh, The CentOS Project +44-207-0999389 | www.centos.org/ | twitter.com/CentOS