Hope someone can help me with this unusual problem. I installed Ubuntu 12.04 server on a Gigabyte GA-H61M-USB3 motherboard. This all went well. I subsequently installed Apache, MySQL and PHP. This also went well. I am using the UFW kernal firewall instead of the recommended Shorewall (could not find the repository during installation). I thought I had a working server until I relocated the box and attempted to log in using PuTTY. Turns out that the server does not boot without a monitor and keyboard connected. I don't believe there is anything in the motherboard that is preventing the boot. Has anyone else seen this behavior and what was your fix. Thanks.