Thanks Antonio. My video card is indeed a nVidia, that my explain why I don't see the logo. I still have the problem with KDE and ** any other package I try to install**, including non repo apps such as Skype or Flash Player. This happens both using the GUI and CLI. See the following two attempts (I removed useless parts): [root@squarz yum.repos.d]# yum install "K Desktop Environment" Loaded plugins: refresh-packagekit Setting up Install Process No Match for argument: K Desktop Environment No package K Desktop Environment available. Nothing to do [root@squarz yum.repos.d]# ------- [root@squarz yum.repos.d]# yum groupinstall "KDE (K Desktop Environment)" Loaded plugins: refresh-packagekit Setting up Group Process [...] Transaction Summary ================================================================================ Install 118 Package(s) Update 6 Package(s) Remove 0 Package(s) Total size: 306 M Is this ok [y/N]: y Downloading Packages: Package kdelibs-common-4.2.2-12.fc11.x86_64.rpm is not signed [root@squarz yum.repos.d]# Most probably I do something wrong, but I'd really like to know what! Thanks for your time, Enrico Accenti