If you have a battery charger, charge your battery first. Eliminate this out of the equation. Next perform the voltage checks that I outlined on my past post. Let me outline the troubleshooting for the following.
1. Ignition switch circuit - With battery fully charged, insert key, (depress clutch/place in park) turn key to the on position, observe all light in the dash, meter movement of the fuel guage, SRS light, does the radio turn on, can you turn on the wipers, pay close attention to the check engine light, it should light up. With this done and all seems well, assume it good as well as the Ignition switch.
2. Ignition switch - Pull the switch and ohm it out (I don't have the wire diagram readily at hand, but if you have one for your car then it should be a piece of cake.)
3. Main relay circuit - Do the voltage checks from my last post.
4. Main relay - Do the relay check I outlined.
5. ECU - Dude what can I say, swap it out with a known good one and hope for the best.
Good Luck!