I just rebooted the server, but doesn't go up anymore.
What can be the problem?
Server is RedHat and i used 'reboot' command from root ssh.
closed as not a real question by Karan, Tog, Scott, Brad Patton, Nifle Apr 27 '13 at 7:46
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, visit the help center. If this question can be reworded to fit the rules in the help center, please edit the question.
If you have physical access to the machine or a KVM, hook up a monitor and observe the most recent output. It's possible that the system experienced a kernel panic or a generic boot failure and is standing by whilst still powered on. If nothing is displayed, try a cold reboot and check for any output during the POST and boot sequences