My linux gateway server is not responding. its Red Hat Enterprise Linux AS release 3. We can access internet but we can't access it through SSH / Telnet from remote and also from its own monitor. the screen is totally blank. Bugzilla is installed there and also some network monitoring tools. nothing is accessible. I have found Capslock and Scrolllock keys are blinking.
I am worried to restart the server cause there is a chance of loosing all the data! Is there any chance to survive? or anything i can do to fix it?

Thanks in advance!