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I received my new eBay purchase, a computer destined to become a Fedora 12 box. Once I had a VNC server set up and running, I decided to disconnect everything except network and power connections and place the machine somewhere quiet. Then I attempted to power it up, and noticed that it did not appear on the network, nor was connectible, despite numerous tests before when my monitor *was* connected. A couple of searches indicated that the problem was related to Intel integrated graphics and Fedora 12. The fix that worked for my machine is as follows:

1) Open up terminal and become root.
2) Navigate to /boot/grub/ and edit menu.lst with a text editor.
3) Add the “nomodeset” option to the end of the kernel line.

In my case, the line in question became:

kernel /vmlinuz-2.6.31.5-127.fc12.i686 ro root=/dev/mapper/vg_comp4-lv_root noiswmd LANG=en_US.UTF-8 SYSFONT=latarcyrheb-sun16 KEYBOARDTYPE=pc KEYTABLE=us rhgb quiet nomodeset

After that, rebooting without a monitor works perfectly fine, allowing me to access the box without any problems.

Reference: [1]