My boyfriend disconnected something on my Ford Expedition so it won't start. The lights go on inside but it won't even turn over. I am stuck with our three year old son with no car, I don't know what to do. Can someone please help!? Thank you:(

I'll bet the starter solenoid wire was disconnected, or maybe the starter relay under the hood. Look for anything that looks like it's missing in relay and fuse boxes under the hood. They're labeled what is what under the covers.

Did any fuses get pulled out? This happened to me and the fuse for the ignition switch got pulled out. Don't know if that's your problem at all but it would be worth it to check it out. I had to pay for my car to get towed. My brother didn't realize when he put the fuse back in that he put it in a spot that was just a blank fuse holder. Good luck!

First check all of your fuses. There should be some right under the steering wheel and then some under the hood in front of the driver usually. If you don't have a fuse tester, pull them out individually and look to make sure the two metal bars are connected inside the clear plastic piece. If they are all good, look on your battery and find the positive terminal. It will be the post on the battery with the big plus sign. Follow the positive line back until it comes to a cylinder, usually black. This should be your starter solenoid. Make sure the positive line is connected to it. There should be a smaller line also on the solenoid, make sure it's attached. If the positive cable is not attached to anything other than the battery, pull the chord as close to the engine as possible without touching the engine. I repeat, do NOT touch the engine with this chord. Big sparks are a bad thing. On the solenoid, there is one big bolt and one small bolt. Both require a wire to be attached.

Besides the fuses and relays,I agree with above it could be the small wire on the solenoid has been removed.
The solenoid is the part between the Battery Positive terminal and the Starter. Follow the big red wire.