greetings - I'm trying to upgrade a centos 3.6 box to version 4. I tried to do an upgrade using yum but that failed and now the Cd installer is not letting me upgrade either. Here's what I did: following the howto, I tried to do the upgrade using yum. I installed the GPG key and upgraded the centos-release and the centos-yumconf packages. When I tried to upgrade yum package I ran into dependency problems. I downloaded and reinstalled the version 3.6 centos-release rpm. Then I downloaded and burned the CDs. I boot from the CD but I don't see an option to upgrade. I get to the installer screen that asks for the type of installation (desktop, server, workstation etc) but I see no option to perform an upgrade. Is the upgrade option hidden somewhere? did the installer not detect my centos 3.6 system? When I tried the yum upgrade, did I do something to make the installer think I have centos 4 installed (like the GPG key)? Any help is appreciated! cheers Mike