I've spent most of today installing Server 11.04. While I can't get network installs to work at all (different issue, I'll post a separate question/bug), when installing from the server CD, all goes well until I reboot. When the computer reboots, I'm presented with a blank screen. I can't switch to other virtual terminals, but the system is running.
By accident I found that if I boot with the monitor unplugged, and plug it in after the computer is booted, the login prompt displays just fine. This is a server, so there is no Xorg involved, but it seems as though it tries to display some unsupported text mode.
I've replicated it on two servers. One is a Dell and one is an HP. They both have onboard video, no secondary video card.
Any idea where to change that?