[geekmaster]

If you feel up to it, you could connect to the internal serial port and see what status messages it is displaying during startup. Also, you might be able to get a serial port root login for a few seconds before it powers down. In my case, I did a copy/paste from a script on the host to the terminal login prompt, to execute commands quickly before it powered down. Then I looked at the terminal scrollback buffer to see the results of my commands. I had to reboot multiple times as I investigated what was wrong and how to fix it. I succeeded, as described in a touch serial recovery thread.