Check engine light on,parked car for 2 weeks.tried to start it would not.checked starter and it is good.turns over at starter with screwdriver but wont crank.will not turn over at ignition switch.can anyone help?

Do the headlamps work? Any component that doesn't work, if the component is fuse protected, not only check the fuse, check the fuse circuit for voltage, use a test lite to check for voltage. There are fusible links, one of the positive battery cables goes to fusible links.
There should be a way to test starter motor to see if it will crank the engine. Two voltage circuits at starter motor, one comes from the battery, hot all the time. The other circuit goes hot when starter relay is energized. The starter motor grounds through engine block. I did look at wiring diagram, not sure of your engine size, but the relay had no terminal numbers in the diagram, sometimes that means the relay is soldered into the fuse box, so you can't just pull it out.
You might be able to use a long shank screwdriver and short the two voltage terminals at the starter motor, it may crank the engine. At least you know the starter motor will crank the engine. If you try that make sure tranny is in park or neutral and parking brake is set.

Have you checked actual voltage readings? Use a digital multimeter. Make sure battery has a full charge and battery connections all good. You could have a voltage drop on some of your connections? You have a starter relay on fender lining? I looked up your starter motor, 5.oL engine, no solenoid on top of starter.
You need to check ground circuits, also. Your starter motor grounds through the engine block.

At the starter relay, if voltage and ground are good, you could take two large screwdrivers, touching the two large terminals on the relay, let the shanks of the screwdrivers touch, the starter motor should crank. You don't need to use the key. There are safety issues when trying this, you have to be sure the tranny is in park or neutral and functional parking brake is set, block the wheels. Safety is your responsibility.

There could be other issues?

You are saying that the starter motor is not working, that the engine is not cranking over, even with a boost?

If so, then either there is a problem in the starting circuit between the ignition switch and the starter, or the starter is bad. There is a way to check the starter on the vehicle: the starter will have 2 electrical connections. One is the positive battery cable, and the other is a small wire connection to the starter solenoid, mounted on the starter. The key should be off, the brake set, and the transmission in park or neutral. Use a small jumper wire or a small screwdriver, and jump the battery cable connection to the solenoid connector. Take off the solenoid electrical connector if you need room to do this. With key off, the engine won't fire and run, but if the starter is good, then jumping those two connections will make the starter engage and spin the engine over. (Of course, if key is in ON, the engine should start and run.) But you are just checking starter operation, so keep the key off. If starter is good it will crank the engine over. If jumping the two connections causes nothing, then it is pretty certain the starter motor or the solenoid is bad, and you need to replace it. (Take off the negative battery cable from the battery first to remove the starter from the vehicle.)

If jumping the starter caused it to operate, the starter and solenoid are good, and there is, again, a problem in the start circuit from the ignition switch to the starter solenoid. It could be simple like an electrical connection (like the one right there on the solenoid), or a component in the circuit between the ignition switch and the starter solenoid, like the neutral safety switch for example. You will need a wiring diagram and a multi-meter to diagnose further. Good luck, and hope you find the problem. Are you sure your battery is still charged up good?

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.

Could be a bad starter. Try tapping on it with a large screwdriver or hammer, then try starting. If it starts that time, bad starter.
If you know how to jump the starter solenoid to the starter motor, you could check starter operation. On the solenoid is a purple wire. Use a small screwdriver (key off, car in park) and bridge that post with the purple wire to the large battery terminal on the starter. If starter is good, it will start cranking the engine. If you just get another click, the starter is bad, assuming the battery cable connections are clean and tight.

1. Test battery (Should read 12.5-13v). If not charge or get tested, may need replacement.
2. If battery is good, take a pair of jumper cables, connect Black lead between (-) Negative side and the the block of the engine (often there are metal brackets, etc they make good connection points). Then connect the Red lead, between the the (+) Positive side of battery and JUST TAP the end to battery connection on the starter solenoid to see if engine turns over. CAUTION: Engine vehicle is in Park, parking brake set, and will not move before attempting this procedure.
2a. If this does not turn over engine, remove starter and have it tested at an auto parts store.
2b. If it does turn over there are two paths to further troubleshoot. (1) check battery cables. One way to do this is to turn the ignition key on, and attempt to start the car by the method described in 2.. BUT EXTRA CAUTION: Engine vehicle is in Park, parking brake set, and will not move before attempting this procedure. (2) if the truck did not start in (1), then you will have to wire trace the starting circuit checking all fuses, connections, etc. (local auto parts stores or often local library, carry Haynes Manuals that have wiring diagrams int the back)

Best of luck resolving this problem.

SOUNDS TO ME LIKE FAULTY ALTERNATER AS WHEN ENGINE IS RUNNING ALTERNATER PRODUCES THE POWER NOT THE BATTERY

If the car does nothing at all when you turn the key, the first thing to do is make sure the battery has sufficient voltage. Do this by turning on the headlights. They should be very bright. If the battery is good, check all connections between the battery and the starter, check for blown fuses. If everything checks out ok, then you need to make sure the starter is good. This can get a little tricky if the starter is hard to reach. With the car in park or neutral, parking brake on, turn the ignition key on, locate the starter. At the back of the starter, there will be some wires connected. The large red wire is coming from the battery. What you need to do is take the screwdriver and touch it to the connection and at the same time, make contact with the engine block. Avoid touching the threaded part of the connection. When you do this there will be some pretty good sparks, so don't be startled. As long as you hang on to the screwdriver by the plastic handle, it can't harm you. If the starter is good, it will engage and start the engine. The problem would be in the ignition switch, or more likely, in the starter relay in the main fuse box under the hood. If the starter doen't engage after a couple of tries, it should be removed and tested.

try it in nutral put in park and hold up and or jigle up and down in park, dont come out of park jiggle while u hold to start,check large fuses anything marked starter check cables cable ground to engine ,check nutral safty switch check starter , and starter wire ing wire at starter with test light small wire on starter while someone trys to start jeep ground test light to a good ground and hold point on small wire on starter it should light up if it does your starter is bad ,if it doesnt light up check ignition switch on steering colum ,most likely bad

check the ground connection between the engine block and the battery