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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.

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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.

I think we'll need more information than that. What happens when you try to boot it? – ForeverWintr Apr 26 '13 at 5:38
well I logged as root and just typed 'reboot'. Then message "system goes down for reboot" showed and didn't go up after this.. that's it. – Jason Paddle Apr 26 '13 at 5:41
What does "didn't go up" mean? – ForeverWintr Apr 26 '13 at 5:42
Found the problem. Was it between the server and the switch and the speed between. Need to set speed to 1000Mbits, duplex to full and turn off auto negotiation. – Jason Paddle Apr 26 '13 at 7:01
Because your question is impossible to answer. There are hundreds of reasons why a server might not reboot correctly, it is impossible to know which is the case from the information you have given. All we know is what you tell us and all you told us is "did not reboot". – terdon Apr 26 '13 at 10:31

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

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