Make sure signal source selector on the display is still set to HDMI or DVI
Video is badly distorted
Workaround
Make sure the display is attached at boot time. As Android arranges its desktop layout at boot time, it might be quite surprised by an unexpected display geometry.
SD card
CM-FX6 device lags / poor responsiveness
Solution:
Replace the SD card.
Class 4 or higher is recommended. Different models might perform better or poorer.