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I am running a red hat 6 box that is being used to server e-mail and it has been working fine for about 3 weeks when I decided to restart it this morning. When Linux boots, the startup proceedure is normal except it tries to load INIT: Runlevel 3 and hangs. The only keyboard response I get from the machine is ctrl-alt-delete, which causes the box to go INIT: Runlevel 6 and then hangs. There is no GUI on this machine, just Red hat command line. At this point I have to turn the power off to the box. Any suggestions?
Once you can get into the system (via runlevel 1 or a boot floppy, you could try selectively disabling the services started by init in /etc/rc.d/init.d if need be. Also check your logs to see if any error messages managed to get written before the system hung..