Loaded the Quad 12.04 image onto a card, booted up fine, connected to wireless network, changed wallpaper, shut down. Disconnected from keyboard, mouse and monitor (I run headless). Restarted. Noticed I didn't see it come onto the network. Tried a few more times and nothing. Re-connected to monitor and mouse and I don't get anything. Green light on UDOO but nothing else, HDMI not detecting a source and its not connecting to the network. What the??? UPDATE #1: Ok...re-imaged the card (12.04 Quad again)...loaded it in the UDOO and it boots. Going to repeat and see if it happens again UPDATE #2: Must be a freak occurrence. Since re-imaging it, I repeated the steps, restarted a few times and haven't had the problem re-occur. It is 4:30am...beware of Gremlins!