A reboot is the last thing you should be doing on a problematic box. A reboot should only be attempted if you're 100% sure that the problem can actually be solved by a reboot (for example in extreme cases a buggy kernel module might require a reboot, but even that's a very rare occurrence).

I've seen inexperienced sysadmins remotely rebooting a server only to discover that it won't boot up anymore because the original problem was that the server had run out of disk space.