Sorry. Various Linux systems have a "fail safe" mode where they use simple configuration options that will almost always work to boot the system. If I had a problem with the Linux I use, such as you had with yours, I could instead boot using the "fail safe" mode. I didn't realize that Oracle Linux didn't have that. Other possibilities would to be to make sure you set up a way to access the system externally, from another computer, either via a LAN cable, or a serial port, or both. LAN access could be via SSH. Serial access can be accomplished by running a getty on serial port. If have another machine available, you might consider leaving SSH and getty active, so that you can always access your system, if there's a problem with the usual GUI environment. Then you could edit the GUI configuration file via one of those other connections. Then too, if your system is able to respond to keyboard input with the GUI configuration issue, if Oracle Linux responds as other Linux systems tend to, typically pressing CTRL+ALT+F1 those three keys together at the same time, will get you to a text mode console login, without X windows, so it doesn't rely on the GUI configuration file. That should usually work to allow you to edit the GUI config. file.
Last edited by kakaka; 11-12-2012 at 02:32 PM.