What prompted you to do that? Problems with the server? What problems? Was this server up and running for some time? A new install?
Do you have an Ubuntu or any Linux Live CD? If you do, the simplest thing to do then to eliminate a lot of guessing would be to use the Live CD and go to the site below and download and run the bootinfoscript which will give useful details about your boot files/setup? Read the instructions first!:
It will output a results.txt file which you can post here.