Clearing up confusion about the Mac mini (the Unofficial Apple Weblog :
Yes, it will boot headless, meaning with no display or video device connected.
While it is strongly recommended that you only have an Apple Autherized Service Provider crack it open and
install RAM, hard drives, Airport and Bluetooth, it will NOT void your warranty if you do it yourself. As is standard operating procedure, however, anything you break while attempting anything on your own is not Apple’s responsibility.[…]
The reason the TOP of the Mac mini doesn’t glow and pulse (this is my only gripe so far) is that there wasn’t
enough room to light it once the optical drive went in :)
Which concludes today’s lesson: Go get one.