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I have assembled PC based on Intel D2700DC mini-ITX motherboard to use it as headless server. I was able to install Fedora 17 Linux on it, and it worked fine until I disconnected display.

It still works perfectly if display disconnected after it booted, but won't start unless display is connected.

I have updated BIOS to the latest revision, turned EFI boot on and off, juggled video settings but that had no effect.

Initially, I thought it was a GRUB2 loader problem, so I used /etc/default/grub from this thread and regenerated grub config, but that had no effect. It also behaves same (boots with display, doesn't without it) with live usb stick with MS-DOS I have used to update BIOS.

Is there any way to make it boot without display connected?

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It appeared that I was need to disable IGD as well as beep warning on video device not present in BIOS. If you will ever need to enable it back, you should switch on-board jumper to switch BIOS to the Maintenance Mode. Integrated Graphics Device will be used by default during Maintenance Mode.

UPDATE:

Adding vmalloc=256MB video=LVDS-1:d to the GRUB_CMDLINE_LINUX_DEFAULT and regenerating GRUB config (via grub2-mkconfig -o /boot/grub2/grub.cfg) solves issue without need to disable IGD

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