Heh I've been there so many times. Shouldnt be too hard. First off what is the problem? Is it not getting spark/fuel or is it not getting a crank signal to send power to the starter?
Here a couple ideas
No spark? - This almost always has to do with the oil level sensor. If it is unplugged or the wiring got ripped it will not supply spark to the engine.
Does not crank? - Step one would to to see if it is getting a signal from the interior of the car. You can check for the signal at the c100. If you are getting the signal from the interior then the PCM is refusing to send the signal through for some reason.
In any case you can use a screwdriver to jump the power wire stud to the solenoid stud on the starter to crank it just to see if it will run.