[SPARCbook] 3gx in a coma: meaning of startup codes?

[Tim Strobell aka Griffy]

Howdy Gentlemen,

I've been using my Sparcbook for several months now without a problem...until
yesterday. 
After rebooting the machine (60+ days of uptime), it seems to be dead. 
The green power light is on, HD has spun up, but no display.  Pause-R will
reboot the machine, but Pause-O won't work. The display sequence goes 0D0 007
0C0, and there it hangs.
I've looked through the archive and the FAQ; the only thing close was a
machine stuck at 0D0 which indicated a half-dead battery. I've cracked open
the bugger before, so I'm willing to try yanking out the battery -- but it's
been on AC power only for the last few months.

Suggestions?

Tim

--
Tim Strobell aka Griffy, griffy at math.umd.edu
Assistant Sysadmin and Server Janitor, Math Dept., University of MD