Reply 40 of 59, by yawetaG
If the VGA connector is a standard one, you could try another monitor that's known to work, or try the original monitor on another system (be sure to change the resolution to something the monitor can accept before trying the last one). That would at least let us eliminate the monitor as the problem.
As an aside, does that 3.6V lithium battery still work?
Edit: Dug through some manuals and it looks like Epson kept the connector codes pretty standard throughout different models, which means your battery is attached to the right header (CN1), is the right type of battery, and the polarity was respected. However, the manuals do mention the batteries run out after 3-5 years, so it's likely the battery is dead. When replacing it, insulate it electrically from touching the case.