Sometimes (10%, maybe), when I wake my Galago from sleep, the screen flashes, but remains black. The LEDs on the front seem to indicate that it's running. I've tried CTRL-ALT-F1 followed by CTRL-ALT-DELETE to reboot, but that doesn't work either. The only thing that seems to work is to hold the power button until it restarts. I haven't tried to ping the machine while in this state.
I'm using VMWare Workstation -- not sure how that affects things.