Well ya gotta start with the basic three...fuel spark and air...

Easiest way to verify the first two is try to crank if a few times. Then pull a plug out and smell it for gas...it might be a little wet also..hook it up to the wire and try to crank it again to see if there is spark. No spark on all 4 = bad transistor(uncommon), no crank/cam signal etc. No spark on a pair of cylinders would likely be the coils, or maybe power transistor. Individual cyls would be bad wire, plug.

What year is your car/motor again?

Also you did check all the fuses...right?? lol its probably something stupid related to what you did recently..