Won't start willnot turnover

I assume you have checked the battery? If less than 12.4 volts that is probably the cause of the problem. If it is OK, get under the vehicle and thump the starter solenoid (the cylinder attached to the starter itself) with a hammer to loosen any internal rust. Also check the earth connections - finally jump the connections on the solenoid with a BIG screwdriver - but keep your hand well clear of the metal parts unless you want a nasty shock. If all this fails, you probably need a new starter motor