FC12: yum update then boot hangs// preload daemon

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http://forums.fedoraforum.org – Have had a clean perfectly working copy of for months and after two updates to and, neither of the newer kernel versions will allow machine to boot properly. Start-up hangs at the preload daemon with a flickering screen. To use machine, must use grub chooser and choose the original base kernel. Running on Tyan h2000m board, opteron 2356, Nvidia 9800 GTX+ and 12GB of dram with SELinux security enabled. TIA, V. (HowTos)