Keep it simple. Check the easy stuff first. Gas in the tank? Fuel pump working? Listen when you turn the key. Air cleaner clogged?
Pull the plugs. No shame in letting the pros check it out if you cant find it.
MikeM

&nbsp\\;

 

&nbsp\\;
&nbsp\\;Could you take it some where to see if any codes have been tripped? Picture shows a cylinder head temp sensor and at the baseof the front cylinder there should be a crank position sensor, this sensor sends a signal as to when the plugs should fire. It senses the teeth on the flywheel and the empty spot where there are no teeth. Also known as the CKP sensor.&nbsp\\;