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I'd start by doing a power check from the battery to the starter,
- Battery - charged, connected, terminals good, wires good, ground cable connected to engine/frame?
- Heavy red wire connected to solenoid, and from solenoid to starter?
- Solenoid function check - small terminal to positive - if it works then check power source from ignition switch - if it doesn't, short across thick wire terminals. - if it works then solenoid is the problem.
Reply as a comment to this post to get back to me.
well first thing to check is the battery working. turn the headlights on. do they light up bright. dim would me you need to charge it or replace it. if that's not the issue the starter will go and that makes the engine turn over when you use the key. the igniton or shifter could be another problem try starting it in neutral if you suspect the shifter cable. my guess is the battery. or the connection for the cables to the battery. but need to check and test stuff
IF the car cranks over but doesn't start you need to see if you have Spark and Fuel. IF it doesn't crank, check starter and related circuit, tapping on starter will sometimes help to get it rotating. Check all fuses, and make sure battery terminals are clean and tight. Have someone or yourself connect a scanner DTC reader and see if you have any engine computer faults. If manual transmission make sure your clutch pedal switch is not missing the bushing. Aftermarket alarms can cause no starts also, but usually a "no-crank" situation.
Where was it stored? If corrosion is the issue, battery cables, wiring to alternator, alternator itself, battery terminals, fuse block, anything moisture got to sit on or near for more than a week or so. Miatas hate water in my experience.
Could be a miss aligned switch try wiggling the shifter in park the next time it dose not start to see if starts.Also dirty battery cables will give you the same crazy makes no sense problems. Clean both the post of the battery and the cable ends and make sure they are tight. Your car needs a completely charged battery (14.2volt at the ignition) to start, were as the radio and other electronics, locks, windows, etc. only need a few amps. .
Check the ground cable going from the battery to
alternator, then to chassis. Make sure there is no
rust at the chassis ground wire terminal, and that it
is very tight. The fusible link will be off the alternator
red power cable,usually, but not 100% on that car.
Check the battery connections. If they are dirty, corroded, the lights will work, but there won't be enough connection to crank. Also, if the battery is getting old, it could be going out as well. Clean the battery terminals with a batt terminal brush- also clean the cable ends. Charge or jump start your car and run for a while.