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Generally, no, unless you've done something silly like running a lot of code that doesn't need priviliges as root, and that code proceeds (by accident or design) to do the equivalent of rm -rf / (or hoses some other critical system files). Unfortunately, we really need a few details to figure out what happened. Please try to boot the machine, and write down the last few lines of output before it fails. Even if you don't understand what they mean, someone here probably will.
I really can't remember the exact output I got. I can't get it again because we reinstalled redhat again.
Other symptom of this problem is that the root password got changed last time. I am sure that I remember the password. But when I type it the computer does not accept it.
Now it has happened again. We reinstalled linux on last Friday and everything worked fine. But when we try to login on Monday(Saturday and Sunday were holidays) the computer says that root password is incorrect.
Are you using the same root password everytime you are re-install Redhat? Try a different password. Yes, it could be some guy screwing your machine over. I suggest changing the root password and installing AIDE or tripwire to see if anything has been tampered with.
Also, make a note of the error messages you get when you boot up the comp.
pay attention at what runlevel is being used to boot your system.. check the number of the system run level... for example if you configure Slackware 10 to start on run level "6"
it will keep rebooting and rebootiung at every start-up!
But that number changes from distro to distro...
Does that runlevel (level 6) really change from distro to distro? I haven't used all the distros but I have touched SuSE, Debian, Redhat and that runlevel is pretty universal (at least on linux) I thought.