You could perhaps try and see if it's got the notorious sammy "clicky starter" problem. Block the wheels, set the brake and take it out of gear(put it in neutral). Then connect a 12g or so wire to the small wire connector on the starter. Make sure you are all clear of any moving parts and touch the other end of the wire to the battery + terminal and see if the starter engages. If it doesn't, then I would suspect a bad starter. If it does, then check the voltage coming out of the factory wire to that small terminal on the starter and see what voltage you get when you turn the key. If you get good voltage, then it might be the clicky starter problem, if you don't get good voltage then I would suspect ignition switch or wiring, possibly the safety switch on the clutch pedal if it's a stick or on the tranny tower if it's an auto... If you determine that it's the clicky starter problem, do a search for "clicky starter" and you should find a lot of info on how to wire in a relay to fix the problem and still use the key...