Initial problem: failed emissions testing yesterday, due to high hydrocarbons. Drove to local parts shop to get spark plugs, since I was told by emission shop that was the first thing to suspect.

As I got back in car to leave parts store.....car would not crank. Heard fuel pump run briefly and a single click from engine compartment, then nothing. Lights, radio, windows etc all work fine. I tried starting while jigling shifter all around neutral and park to no avail. Guy in store came out with portable battery jumper and tried that too..still nothing. I then figured the OVP relay had gone bad again, since this is how car acted about 4 years ago. So today I purchased a new OVP relay and put it in after work...still nothing (no crank, fuel pump runs, and only an occasional single click when turning key to start). I also had searched forum last night and had decided I would try jumping X27, as per Arthur Dalton's informative posts (hope you are reading Arthur!). But unlike the posts I read last night which all indicated starter engaged upon jumping 12V to middle terminal of x27 today, I got nothing. Only a small spark at terminal/jumper indicating I had current. I am now assuming I have a starter/solenoid problem.

I had to get the car towed back home tonight from auto parts store since I was unsuccessful in getting it started. And I really don't want to buy any more parts unnecessarily (I now have and extra non/refundable $60$ OVP relay). Any suggestions from anyone on how to procede? Arthur?