On a Intel DN2800MT-based system, so having Graphics Media Accelerator 3650 integrated processor graphic card, your screen turn to black/off during the boot process, exactly starting when the system switch to framebuffer if you connect a VGA screen (no problem so far with HDMI).
Passing nomodeset or any similar option is of no help.
You cannot invent it, apparently GMA 3600 kernel DRM driver always assumes there is a LVDS panel, as it would on laptop but probably not on home servers, and defaults to a 1920×1080 panel.
So you need to add to the grub kernel line:
Or, in /etc/default/grub :
And run update-grub afterwards.