Right, by editing the boot entry, usually by selecting your distro and pressing E (grub) or TAB (lilo) you can edit the paramaters. add "single" (no quotes) to the end of the kernel line, hit {RETURN} to launch.
When you get to the shell, run
(replace /dev/sda1 with your primary disk partition. # fdisk -l for a list.
# mount -o remount,rw /dev/sda1
Now you have full read/write access. You can backup your data, and use yum to uninstall and reinstall gnome and see if that fixes the problem. also try a yum repair if available.
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by: savonePosted on 2009-10-27 at 09:35:57ID: 25674461
Boot into single user mode and correct the problems.
/manuals/l inux/RHL-7 .3-Manual/ custom-gui de/s1-resc uemode-boo ting-singl e.html
http://www.redhat.com/docs