car was running fine, recently inspected, hit a pot hole, immediately after the car died & now it won't start or even crank over..how do i troubleshoot...can't afford a shop, need a DIY fix

checked the battery, the gas, car has power (radio/lights), thought maybe the connection to the starter was loose, but i took out the smaller of the 2 wires (cliped) to the starter and re clipped it - still nothing...been googleing and no luck.  I also noticed there seems to be alot of fresh grease (still wet) under the car ??? could something have blown/bust...if so how can i tell? Especially since the car won't even start!  HELP PLEASE