My car won't start and the battery is fine. i have a 98 pontiac sunfire 2.4L, please help

Very common. Diagnose and usually have to replace the lock cylinder case. Read this post on Passlock failures
Passlock fixes Ricks Free Auto Repair Advice

These vehicles are prone to failures in the antitheft system. This will actually lock out the starter and/or injectors. Read thru this link, might be your problem.

http://vatspasslockpasskeysecurityhelp.yolasite.com/

Hi.
If there is no power to anything when the ignition is switched on then you have a fault in the main power circuit which could be the main fuse is faulty. Check the main power fuse's positioned by the battery. Also check the main power and earth/ground cables from the battery.
Hope this helps.

try a new battery

I have a 97 Malibu and when the theft system light kept coming on and would only start after letting the car sit for 10 minutes we ended up replacing the complete ignition where the key goes in. Then it was fine. It wasn't cheap either. Sorry, good luck.

if you had the starter recall done, there is a relay mounted near the center of the radiator that controls start power. Pontiac dealer sells the part.

first of all lights on dashbord should come on no matter security or pass key deterant is in .better check "ignition switch".

You might not need a tumble, the sys is controled by the key, and transponder, and the ecm. Most auto locks smiths can come out and check the system, might just need a key re-programed

This sounds like the battery cables are bad, were they covered with white powder?

If your car makes bubbling noise and loses fluid then replace coolant cap. It fixed mine and is cheap fix.