Engine wont start

You have asked a question which cannot be answered without a LOT more information. Like what do you mean, won't turn over? By hand? or by starter? And if starter, have you checked all electrical start systems? Have you TRIED turning it over by hand?? You should have done that FIRST before you ever tried to start it.

If you care about the condition of the engine after 12 years, you have a lot MORE work to do than worry about whether it will crank over. I had the same situation last year with a car that had sat for 10 years, and I worked on it about 2 weeks (off and on) before I ever hit the starter. (Hint: you do NOT want to suck in 12-year old gas and 12-year old oil. Another hint, pull all the plugs and squirt light oil - Marvel Mystery Oil, drain ALL the gas, oil and coolant and replace.) Oh, and by the way, when I finally hit the starter, it fired right up. Now get to work and check back in 2 weeks.

check neutraul safety switch for malfuntion ..It is near the shifter linkage either in the console or under at the transmission link area..

Your car is 18 years old. It's likely history. Sell it as is for what you can get.

those vehicles are common for starters did two today alone when it wont start try to tap it with a hammer it on the back side of the engine under the intake if it starts replace starter

Check batry terminals are secure & free from corosion, check security of earth strap to engine & main power wire on starter, if ok have the batry load tested to ensure it can perform under load as the starter needs a lot of current. Have you tried a jump start?

I wouldn't think catalytic converter, without it giving some indication that it was going bad, but without testing it is hard to say.
When it cranks and won't start, check for battery voltage to the coil on the dark green wire, with key ON. If you have power at the coil, it might be a bad coil. If no power to the coil, it could be a Crank Position Sensor or the Cam Position Sensor inside the distributor. If one of those is bad, it can stop the computer from sending power to the coil.
Good luck.

If it is a 3.8 engine change the crank sensor,they go bad on the 3.8 engines.

When they won't park it's 99% need new wiper motor

After for setting for so long it is possible the pump picked something up and it clogged the injector.

Any additional information will be helpful. Is the engine turning over at all?