I'm installing Ubuntu 10.04.1 server edition and the installation is completed with success. When I then try to start up booting from harddrive it freezes after BIOS with a _ blinking in the top left corner and nothing happends.

10.04 LTS Desktop edition runs perfectly from live cd on the same machine. I've ran a few diagnostics from the ultimate boot cd but none of them finds any problem.

Any suggestion what I can do to determine what is wrong and/or how to fix this? Step by step instructions preferred.